When Octavius introduces his four arms, and as he turns to have the device attached to his back he says, "They are impervious to heat and magnetism." As he turns his lips are not moving but we hear him speaking.
In the first battle scene with Doc Ock fighting Spider-Man, Spider-Man, who has strength proportionate to a spider, hits Ock plenty of times, not only with his fists, webs, and feet, but with a desk and a window, too. All of these times Ock barely flinches with the blows. And yet, at the end of this scene, the elderly Aunt May clubs Ock over the head with an umbrella hard enough not only to make him back off but to break his sun glasses which were previously unscratched.
When Harry talks about Dr. Octavius' chances at winning the Nobel Peace Prize, he walks out of the scene saying, "See you in Sweden!" Although the Nobel is named after a Swedish man, the Nobel Peace Prize ceremony is held in Oslo, Norway. An easy mistake to make.
Spider-Man's web is sticky right from it exits his wrist. But at the end of the movie after defeating Dock Ock, he moves towards MJ without sticking. Moreover, none of MJ's hair, dress or skin seems to stick to the web.
After fighting outside of the bank, Doc Ock is carrying no money bags. There are many shots showing all his free hands and even when they leave the bank initially there is nothing in his hands. Then when we see Doc Ock leaving there are two money bags in his tentacle.
When Peter makes his pizza delivery the clock behind the woman's desk shows it to be about 2:06. When Peter gets to her desk a few seconds later to drop off the pizzas, the woman looks at the clock on the wall and the time is 2:03.
When Peter jumps across the table to save Mary Jane from the car coming through the window, her chair falls over as he grabs her. In the next shot we see him lift her out of her chair without toppling it.
When Otto Octavius is demonstrating the fusion experiment to the group, Peter Parker is standing right next to Harry. In another shot, Harry is by himself. In the next one, Peter is back next to Harry.
When the film begins to play the "Raindrop Keep Fallin' On My Head" song, the viewer could see that Peter is walking in Central Park and then proceeds to fall. When he gets up however, you see him standing on a busy street.
When Dr. Ock and Spider Man are fighting and fall on the passing train, they start rolling, leaving huge dents on the top of the first car, as seen by the passengers inside, yet in the next shot the train appears undamaged.
When Aunt May is moving her things out of the house and Peter comes over, she gives him a hug. The first shot shows Aunt May's head resting on Peter's right shoulder, but in the next shot, Aunt May is resting on Peter's left shoulder.
When Dr. Ock walks out of the hospital and flips the taxi that's coming toward him, the oncoming traffic changes between shots. You can see that the car is going to land on its hood in the middle of the street and there are no cars parked, yet in the next close-up shot, it lands on its wheels and over a parked taxi, pointed on the wrong way.
When Henry (the little boy helping Aunt May pack) says, "Hi" to
Peter, he is standing by the driveway, yet in the next shot when Peter tells him "You're getting tall", they both are standing several feet away, right in front of the garage door. The same switch takes place when Aunt May tells Peter "Everybody loves a hero".
When Spider-Man saves Mary Jane and has her suspended in a web on the crane, the first shot shows her on the very edge of the right-hand side. In the following close-up shots you can see plenty of web to her right, making it look like she is in the center.
At Joe's Pizza in the beginning of the film, as Mr. Aziz is speaking with Peter, a man sitting at a table behind Peter is drinking from a cup labeled Dr. Pepper. In the next shot, the man has an empty 20 oz. Dr. Pepper bottle next to his cup which subsequently disappears again.
When Aunt May is outside her house packing her things into boxes with Henry Jackson, she hugged Peter after saying 'I love you, Peter.' When she first hugged him, her head was to Peter's left shoulder. But when the view changes, she has her head to Peter's right shoulder. When the view changes again, her head is back to Peter's left shoulder.
As Peter is walking along the top of the building, about to do his "I'm back" jump, he is about three quarters of the way past a skylight on the roof. Then the shot changes, and he is just walking up to it.
When Peter is first seen running with the pizzas, he is carrying eight boxes. In the next shot he is carrying seven, and Spider-Man only leaves seven on the balcony. When Peter delivers them, there are once again eight boxes (two have been crushed together, but this does not account for the changing number of boxes).
After Spider-Man loses his powers for the first time, he falls in a puddle which soaks his hair and leaves one part of it sticking up. As soon as he attempts to climb the wall, though, his hair is not only slightly wet but it is perfectly combed.
In the pizzeria when Peter is being fired, there are words at the top and bottom of the clock behind him. Halfway through the scene, there are only words above the clock. The words at the bottom are gone.
In the "Horror Hospital" scene, Dr. Octavius is prone on the
operating table with his head supported by a Mayfield horseshoe in all shots except the one from underneath the table looking up at his face where his head is held in place by a Mayfield skull clamp (a.k.a "Crown of Thorns").
When Dock Ock is climbing the building right after the bank heist, we see from inside the offices how the tentacles crash though the wall - the pincers are closed in their "spiky" form and penetrate the wall completely. However, when the view changes to outside we see the pincers open and "grabbing" into the masonry, not going through the wall but only into it enough to hold on.
When Peter and MJ are walking together after Peter goes to see MJ's play they stop to talk to one another at the end of the street. In this shot there is no car behind MJ but the next camera shot facing her shows a taxi in the background behind her which she later gets into.
When the first experiment demo went wrong and Spiderman tried to pull the plugs, Otto Octavius hits him with a tentacle with Spiderman's head pointing downwards. In the next shot, when Spiderman hits the wall, he is upright.
During the train scene, Spider-Man's mask had gone partially black. We also see it when Spidey puts his mask back on. Yet when Doc brings him to Harry, we don't even see a patch of darkness on his mask.
When Dr. Octopus is robbing the bank, NYPD squad car 4619 arrives on the scene. However, squad car 4619 was badly damaged during the pizza delivery car chase earlier in the movie - an awfully quick fix.
After Spider-Man recovers from the train incident, Doc Ock smashes in the other end of the train and throws the door on the floor in front of him. The camera cuts to another shot, and when it returns the door is no longer on the floor, nor is it there for any subsequent shot.
When Peter arrives at his aunt's home at the beginning of the movie, it's night. He talks to Harry in the kitchen a few minutes later, and look at the purple balloon by Peter's head, it reflects a window with lots of light coming through it.
When Aunt May hugs Peter near her "hero" speech, she hugs him with her head to his left shoulder. The shot changes and you see that she is now on Peter's right shoulder. The shot changes back and you see her on his left shoulder again.
Regarding the scene where Doc Ock has delivered Spider-Man to Harry's mansion, when Harry pulls off Spider-Man's mask, there is a very obvious and bad splice. The "mask on" Spidey's head is in a different position and further away than the "mask off" Spidey's head.
During the final conversation between Spider-Man and Doc Ock, the rips in Spider-Man's suit keep changing. For instance, there is a tear on his right shoulder; for most of the scene, there is a single piece of black webbing left holding the rip together, but when Doc Ock grabs Spider-Man's arm, the rip now has two pieces of black webbing. Then it goes back to one.
In the scene where Peter is riding his scooter to Mary Jane's play, after the music fades out you see a black convertible being chased by several police cars. The black convertible is rammed forcibly, and you see many hideous dents on the side of the car. Thirty seconds later, after Peter is done talking to the kids, we see the same car from the same side it got rammed into, but the hideous dents have vanished.
As Peter stops the elevated train with many webs, a tear appears in his suit on the inside left arm during a closeup. Later, when his arms are still outstreched, there are many shots where you can see that the tear has disappeared; for example, a few shots later when he is still trying to stop the train; when the passengers are lifting him over their heads into the train; and many others.
In the scene with Peter's "I'm back!" jump, It shows a shot from above and you can see his solid outlined shadow in front of him. However, in the very next shot it shows you a close up of Peter walking, and there is no longer a shadow there.
On his last pizza delivery before he gets fired, when it first cuts to the receptionist and the room that she is in, the clock is very high up in this shot, above the receptionist's head, then in the following shot when the receptionist is looking in Peter's direction, the clock is much lower.
Just after the bank robbery, Spider-Man and Doc Ock are on the side of the building. Doc Ock says "oops, butterfingers." Spider-Man shoots a web to catch Aunt May. In this shot, Spider-Man is on one knee with the other one resting on the wall, yet in the following shot he is standing up and leaning back to pull Aunt May up.
When Doc Ock carried MJ up the side of the building after he kidnapped her, one of the D'Agostino banners was ripped out of the building and fell. But when Peter came out of the deli and looked across the street, the banner was back on the building and the building wall showed no sign of damage from Doc Ock's tentacles.
Just after the car goes through the cafe window and almost hits MJ and Peter, they both get up and most of MJ's hair is blown back over her shoulders. However, in the following shots, there is now a lot more at the front of her shoulders, than in previous shots. Throughout the movie, her hair changes position in consecutive shots.
Close to the middle of the film when Peter is in the big room where MJ announces her engagement, when Peter is finished talking with Harry at the bar he gets pulled away by Jameson, Harry then turns around and drinks, yet when it cuts to a shot of Peter and Jameson walking away, look in the background and Harry is still looking at Peter walking away.
Near the end of the film when Peter takes his costume back from inside the Bugle, Peter's boss at the Bugle takes down the note left in a web, in one shot his fingers are half way up the note, in the following shot there right on the edge.
Near the end of the film when we see Peter looking out of his window from his apartment, the girl from across the hall offers chocolate cake. When they are done eating, Peter is holding the fork with his thumb and in the following shot he is not. The fork has moved across the plate a little between shots.
There are two close-ups of Peter's head when he is lying on the floor of the train: one of the shots has a black shoe with white laces very near his head, the other a blue, white, and black shoe, also right next to his head. In the wider overhead shots of Peter, no one standing around him is wearing shoes like that, nor are they standing close enough for their feet to be in the close-up shot in the first place.
When the people are watching Doc Ock with his experiment, Rosie is standing at the bottom of the stairs. When Doc Ock passes her his coat, she is then seen in the background standing next to a large TV screen.
When Peter starts to lose his powers, and tries to climb up the side of the building, in several shots, he is by a window, and he slips opposite the window, yet in the following shot he is a lot further above the window. His distance and position from the window changes in subsequent shots.
When Doc Ock escapes from the hospital, he hits a taxi with his tentacle. The taxi goes flying and is about to land on its roof in the middle of the street. The next shot however shows the taxi landing on top of another one, and the taxi is right side up.
After Doc Ock throws the car through the side of the deli, it shows Peter and MJ from outside the building and there's a table with a chair at the base of the hole right up next to the nonexistent wall. For the rest of the scene, the table and chair are not there.
When Spider-Man takes back his suit from Jameson's office, Jameson looks up at the skyline, and there are no steel or metal bars running over the skyline, yet when the camera zooms out with Jameson yelling "I want Spider-Man", metal bars have appeared over the skyline that were not there in the previous shot.
In the elevator scene when Peter/Spider-man first loses his powers, we see a man standing outside the elevator holding a dog on a leash. However, after Spider-man delivers the line about the costume riding up on the crotch, we see the man use both hands to adjust his jacket, and the leash is nowhere to be found, nor is their any indication that the dog is on the elevator.
At the beginning of the film when we see Peter in Jameson's office, Robbie says, "Five minutes to deadline Jonah." Jameson raises his hand to him, but in the following shot it's a lot lower. Also, when he's talking about a food poisoning scare, he raises his hand high up to the right, yet in the following shot, it's far to the left of him.
Just after the bank robbery, Doc Ock and Spider-Man are fighting on the side of the building. When some rocks fall down, there is a man (that looks like Stan Lee) pulling a girl away from falling debris. There is a red car to the right of the screen and a yellow taxi to the left, yet in the following shot from a different angle, there are a few more people in front of the red car, and no dust on the ground where the rocks hit the floor.
During the scene where Peter is on his way to the play, he stops the cop car flying through the air by catching it in a web, but the glass shards and debris which are flying along with the car are not in the web anywhere, nor do they hit the people in the path of the car.
As Mary Jane is reunited with John Jameson after Spider-Man lowers her down from the crane, one shot shows tears along Spider-Man's suit along the left leg while he is crouching. However, in a later shot, he stands up to swing away and the tears are now running along his right leg.
As Peter is walking along the top of the building, about to do his "I'm back" jump, he is about three quarters of the way past a skylight on the roof. Then the shot changes, and he is just walking up to it.
When Peter is on the rooftop, just before he does his "I'm back" line, he begins to run. He runs quite some distance before it goes to slow motion, yet a few shots later during the slow motion, he is back to where he started running.
As Ock climbs the building with Aunt May, a girl is on the phone and feels the trembles. She hangs up the phone and gets up to look out the window. At the desk in front of her, there is an employee helping a customer. As the first girl goes to the window, the customer gets up to leave. The tentacle crashes through the side of the building, the camera pans out and the employee helping the customer is away from her desk, the chair is pushed in and the phone is off the receiver.
After Peter came out of the deli, you could see and hear people running around screaming hysterically. But when the shot showed Peter's glasses falling to the ground in slow motion, you could see people were just walking down the street leisurely.
On the way to the play when Spider-Man is chasing the criminals in the car, the passenger is using a shotgun which switches to an automatic weapon which then switches back to a shotgun in a matter of seconds. There is no time for him to switch the guns that fast in the scene.
When the car flies past Peter's head, we have a full view of the tire rim which means we are looking at the side of the car. But this view is only possible if the car were thrown in head-first or tail-first, which wasn't the case.
At the end of the "I've changed" conversation with Mary Jane, the taxi is right next to her as she turns towards it (you can see its roof next to her face), yet in the very next shot she has to cross the street to get to it.
When Peter is being fired from his pizza place job, there is a clock behind him. While the clock is on Peter the second hand is near the 4. The shot then changes to the boss and then goes back to Peter about 10 seconds later, so the second hand should be on the 6 or the 7, but it is up at the 2.
While in the bank trying to get a loan, there is a desk with two chairs behind Peter and Aunt May. As Doc Ock throws the vault door in their direction and Peter kicks the two of them out of danger, there are no chairs at the desk behind them.
In the scene where Aunt May is outside her house, packing things into boxes, we see a close-up of her holding what appears to be a large black leather shoe at upper chest level. The next shot is a wide shot of the yard, and now she's holding it in a different position near waist level.
When John Jameson and Mary Jane are walking down the stairs during John's celebration party, there are two people halfway down the staircase standing by themselves. When it does the closeup of John and Mary Jane, there are four people now standing in that spot.
In the train scene, Spider-Man is thrown through a window and the fight continues over the broken window. When a train is coming from the opposite direction, Spider-Man leans over to avoid it, and the window isn't broken anymore.
Spidey and Octopus fight at the tower and a huge chunk of concrete falls on the street below. Seconds later, however, cars are seen moving around, no honks, no crashes, no problems at all, as if the falling rubble had simply vanished.
Spiderman and Octopus fall on the train carriage's roof and dent it, then roll several carriages back. When the angle changes to an outside view, they are on the third carriage and neither it nor the first two are dented.
When Peter first sees the burning building, there is a far away shot and you see the guy with dreadlocks run to a woman. Then it cuts back to Peter as he tries to become Spiderman then remembers he can't. Next shot has the same shot, only this time it's a close up of the man with dreadlocks running to the woman.
When Dr. Ock climbs a building, a girl stands by a Venice poster panicking. She then walks backwards to the left, but when the angle changes she is now several meters to the right, the opposite direction she walked to.
Dr. Ock punches a yellow cab which flips over and is about to land on its side, inches away from the floor. When the angle changes, the cab is now a couple meters above from the floor, with a cab underneath, plus it's falling on it's 4 wheels.
During the train fight, Spider-Man is about to be run over by a passing train, and he leans against the windows to avoid it. From the front angle his body is leaning on two separate windows, but from the angle inside it's leaning on a single one.
Spider-Man falls on a puddle and looks at the wall in front. There's a window to his right, barely a metre from the floor, and an emergency staircase on the left. When he starts climbing, the staircase disappears and the window is now 10 metres above the ground, on the left side.
Before Spider-Man saves the kids from being run over, they're running and are inches away from the road. Five seconds later, after several flying scenes, they've moved 5 metres behind and are running towards the road again.
When Spider-Man is trying to stop the train, the font left window of the first car shatter, we can see that the handrails are on each side of the door, (pointing toward each other). The next shot shows the suit on his left arm ripping, and then the handrails are now pointing forward. A couple of shots later, when the right window shatters, the handrails are again pointing toward each other.
When Peter Parker arrives at the theater playhouse to see Mary Jane's play, he is driving the car of the criminals whom he had just bagged as Spider-man. In the first wide shot, the car's windshield is intact. However, the subsequent shots show the windshield ripped off at its base. This is because the preceding chase sequence originally included the car driving underneath a semi-truck, but once that part was cut, CGI artists went in and replaced the windshield for the establishing shot.
Just as Peter brings the subway train to a stop, the passengers reach for his chest to pull him back into the train. A passenger's arm touches one of the outside metal handles, and it wobbles, revealing it's made of rubber.
On the way to the theater Peter intercepts a police officer chasing a couple of criminals. At the end of that scene one of the police cars has a tremendous wreck that swings the car sideways. There is a clear shot of the driver with a black helmet on.
There are no elevated trains in Manhattan running near skyscrapers or between high-rise buildings. The longer shots of the train exterior look rather like Chicago "L" lines, and in fact, the 'making of' reveals this footage was shot in Chicago.
Even though the runaway train is shown to be an 'R' service, which is headed for Bay Ridge - 95th Street (in Brooklyn), it is never shown how the fictional elevated line gets to Brooklyn so that the service could join the real life BMT Fourth Avenue Line. The line dead-ends in Manhattan, and never gets to cross the East River.
In the first scene, at a pizzeria located at Bleecker St. & Sixth Ave., Peter's boss tells him he has to deliver a stack of pizzas to the Woolworth Building 42 blocks away. In real life, the Woolworth Building is only about 22-24 blocks away, depending on one's route.
When Spider-man is fighting Doc Ock for the first time in the bank behind Doc Ock are the windows of the bank that he will crash into later. When you look in the windows you see a White bus with a orange line in the middle that says "Metro Bus", a Los Angeles company.
When Doctor Octopus exits the hospital, two of his mechanical arms pick up and throw a taxi, while the other two brace themselves on the street. But when he rips open the bank vault, he uses all four arms. This would be impossible unless his real legs and back had the strength to lift the vault door.
When Peter tries his "I'm back" jump, he is moving in a parabolic curve until his jump fails and he drops straight down into the alley. Physics states that he would have continued on his parabola, causing him to hit the wall at some point.
When Octavius and Spider-Man are fighting on the train, Octavius throws him forward through a bridge and Spider-Man subsequently lands on top of him. This is physically impossible unless the train sped up fast enough to match Peter's speed in that time frame which is very unlikely, or Peter was somehow able to slow himself down whilst airborne, which also seems unlikely.
During the car chase, the criminal in the passenger seat first fires a shotgun at the police, and then when he notices Spider-Man, he pumps the action, but begins to fire some form of fully automatic weapon (a shotgun is not an automatic). In the next shot of the car, he is still holding the shotgun, but continues to fire it like an automatic.
The runaway train is shown to be an 'R' train, and is shown to have blinker doors. In the real subway system, the 'R' is unique in that it is totally underground, except for a short stretch in Brooklyn when it crosses the LIRR Bay Ridge Branch. Also, the 'R' uses R46 subway cars (and some R160s), both of which have sliding doors instead of blinker doors.
During the burning building scene Peter tries to open a closed door with the only trouble being that he can't open it. In reality, superhero or not, the doorknob would've burned his hand due to the incredible heat.
In the train fight sequence, the train says Bay Ridge in the destination window on the front of the train. On real subway cars, there are no destination signs on the cab ends of the cars: only a letter or number rollsign or LED display is present. The only destination signs in the trains are on the sides of the cars. Historically, however, there has been New York City Subway rolling stock that has been equipped with end destination signs (like the Redbird trains used on the IRT until 2003, and the R32 and R38 cars prior to being retrofitted with flipdot signs in the 1990s). Despite this, no rolling stock has been built for the subway with blinker doors. All stock has been constructed with sliding doors. However, this is a fictional route created for the movie (see Trivia), and it might not necessarily be tied in with the real subway system.
Parts of the lower side of the construction in which Doc Ock has set up his second experiment are also made of metal. This means that when the experiment fails again, the base of the building would be sucked into the tritium sphere as well. This in turn would cause the structure to collapse so that the sphere would fall into the river.
When Peter Parker saves the child from the burning building, she is old enough to stand and help him up. However, when he hands the child to the parents after exiting the building, the fake bundle he hands them is the size of the infant.
In the burning building scene, after Peter misses the jump and he's hanging over the fire, he throws the little girl onto the ledge to save her. A dummy is obviously used because of how hard she was slammed against the floor and how she doesn't react to the slam.
When Dr. Octavius' experiment goes awry and the reactor begins pulling all metal objects into itself, a close-up of Rosie shows that her dangling earrings are still swinging freely as she moves her head.
As Mary-Jane is being lowered onto the crane after Spidey has saved her, you can see that her dress is being held together to stop the split up her leg opening up too much. However in the next shot when she runs down the steps towards her fiance, the dress is flapping around and the split is wide open.
Obvious pre-rigging of Spider-Man's costume in the trashcan, presumably to match the famous comic book image of the same scene, which indicates it's a different one than in his hands. He then drops straight down which means it'd miss the can since the can is several feet to the side!
After the cemetery scene and before Peter confesses about Uncle Ben, there is an establishing shot of Aunt May's house. The way her yellow car is parked in the driveway leaves no way for the doors to open. The space between her house and MJ's parents' house is too narrow. Obviously the car was rolled in to obtain the shot.
In the zoomed-out shot of Spider-Man stopping the train, he's not holding onto the webs, nor are they anywhere to be seen. In all immediately-previous and immediately-subsequent shots, they are clearly visible.
When Peter runs down the alley to change in to Spider-Man, his costume has a low neckline to hide beneath his shirt. When he removes the mask after falling on to the rooftop the neckline is higher, indicating that it is a different costume.
When Peter is untying the ropes holding the pizza delivery together at the secretary's counter, near the end of the shot you can see the secretary holding up a bottle of water with a straw in it, and drinking out of it. However, the straw never touches the water.
In the scene where Peter saves the child (Venus Lam) from the burning building, right after the jump over the floor opening, the child stands up to help Peter we can see she wears knee pads under her pajamas.
In the scene where Spider-Man is pushed inside the train by Dr. Octopus and grabs the bar then leaps to the next: The passengers are all looking where they've been told Spider-Man is supposed to be, but none of them are actually looking at him, revealing that he is a CGI image and not an actor.
In the scene right after Peter and MJ swing off and they are on the web, Peter is crawling toward MJ. You can see on his right thigh that where there is a tear mark that his skin isn't showing through, but instead there is a piece of flesh toned material. (It bends unlike the skin on the thigh would)This was probably done so the Spidey suit would still remain tight to Peter's body.
When Mary Jane is being pulled toward the tritium when Doc Ock has her, the shot is taken from her feet up to her head. If you look where her dress ends, you can just barely see that instead of having the regular open dress, it is switched with shorts of the same type so you can't see under her dress.
During the final battle, when Spidey tells Doc Ock "we have to give up the thing we want the most... even our dreams", watch the tentacle behind Doc Ock's head. Right after Spidey says "even our dreams", the three "claws" on the tentacle close, and you can see the tip of the bottom "claw" pass through the tip of one of the other claws, revealing a blunder in the rendering of the digital effect. (This is visible in the DVD release of the theatrical cut of the film. It was corrected in the "2.1" edition, and may have been corrected in the Blu-Ray release, but it's still plainly visible on the original DVD release).
The goof items below may give away important plot points.
When Spider-Man "steals" his costume back from J. Jonah Jameson, Jameson is heard yelling "he's a thief, a criminal" etc., however, in the shot where Jameson is standing next to the web/note left by Spider-Man, his mouth is not moving.
When Harry Osborn is preparing to confront Spider-man he picks up a large sheathed dagger. As he does this, the sound effect is of a blade being unsheathed. We hear the same sound effect a second time when Harry actually unsheathes the dagger just before unmasking Spider-man.
Peter's powers return indefinitely after Doc Ock kidnaps Mary Jane. Peter notices this because he no longer needs his glasses. The shots from his POV change between clear and blurry, glasses off or on respectively. When the shots are blurry, the audio is ramped down.
Spider-Man's right eye-piece is burned during his fight with Dr. Octopus on the train, necessitating its removal. When the mask is returned to Spider-Man, the burned eye-piece is clearly visible. However, when Dr. Octopus delivers a bound and unconscious Spider-Man to Harry Osborn in the next scene, Spider-man's mask is undamaged.
After Spider-man defeats Doc Ock, he and Mary Jane are talking on a giant web. When the camera is on Peter's face, look at the webbing behind him, you can easily see through the clear web-like matter and see the metal wires that make up the web.
Near the end of the movie, in the scene where Doctor Octavius starts his second fusion experiment, Spider-Man pulls out the plugs to stop the machine. But a few camera shots later when Spider-Man takes off his mask in front of Octavius, you can see the plugs behind him perfectly intact.
When Peter and MJ are sitting in the café, there are a lot of people around. When Doc Ock throws the car, there is no one as the car lands, but then when Doc Ock enters the café, there are a lot of people around.
After Doc Ock kidnaps MJ he takes her back to his lab and has got her tied up behind him while he works on his machine. Her arms are almost vertical and straight in the close-ups but she has bent elbows in the long shots.
Flipped shot: Near the end of the film, while Peter is on top of the large crane, he is in a prone position; and we see a rip in his outfit along the top part of his left thigh. Moments later, the camera re-cuts back to him, and the rip is now on his right thigh.
In the warehouse, during the climax of the movie, when Spider-Man is on the ground and Dr. Octavius grabs him, there is a chain on the ground next to Ock's legs. Ock's machine is supposed to attract metal. However, the chain is not being attracted at all.