Continuity mistake: The Goblin throws Spider-Man against a wall. Spidey lands on all fours, looks up, and starts to rise before the Goblin steps on his wrist, preventing him from getting up. In the following shot, Spider-Man's head is beside the Goblin's knee, but in the next cut it's suddenly level with the Goblin's chest. The mismatch becomes more evident when the Goblin says, "You pissed me off." It's not until timecode 01:46:58, after the Goblin reveals his steel blade, that Spider-Man actually begins to rise. (01:46:36)
Revealing mistake: When Goblin attacks Jameson at the Daily Bugle, he's obviously a stunt double and not J. K. Simmons when Goblin makes the glass window explode. (01:15:02)
Continuity mistake: When the Goblin smashes through the window and attacks JJJ, his chair is first positioned at a slight diagonal to the desk. In the very next cut, however, it's suddenly perfectly aligned with the table.
Continuity mistake: This is a little hard to explain. During the Unity Day Festival, after Goblin beats up the cops, the shot cuts and he turns around to face Spider-Man, who lands in front of him. The problem? He was facing the same direction as Spider-Man in the previous shot (you can tell from the background), so it makes no sense that he has to turn around when the camera cuts.
Character mistake: There is a typo on one of the monitors. "human PREformance enhancement" instead of "human PERformance enhancement" (00:16:52)
Revealing mistake: When the car jacker who stole Uncle Ben's car is being chased by the police, they seem to be doing a high speed pursuit. However when the car goes over the corner and demolishes a stand, a cut shows the inside of the car. The digital speedometer is reading 15-17 mph, hardly much of a challenge for the police to catch.
Revealing mistake: When Osborn is gassed inside the vault and the doctor comes to aid him, 2 green squares are reflected on his glasses. The green fumes are already gone so it can't be that. Plus from the opposite angle there's no green wall anywhere, so it was the green screen used on the set or a continuity error when fumes were still on the set.
Suggested correction: I think it's the green smoke reflecting on his glasses. The chamber has rectangular windows so that's why the reflections are rectangular.
I don't think it's green screen, they look a bit small for that but there's something there, you are right. There're green little rectangles on his glasses even when he is doing CPR, when he is looking directly at Norman's face but no green stuff around Norman's head. Perhaps green smoke would be harmful or expensive, so they used regular white vapor and shone green lights on the smoke to make it appear green and later forgot to turn those lights off.
There are monitors with green colored animations throughout that scene, in fact we can see a monitor behind the doctor in the shared screenshot. It could be that the monitor is getting reflected on the glass walls of the chamber which then gets reflected on doctor's glasses.
