Continuity mistake: When Peter first goes to see Aunt May and tells her he's going to ask her to marry him, Aunt May in the first shot goes to hug Peter on his left shoulder, it cuts away and in the following shot she has hugged Peter on his right shoulder so that the camera can see Peter's face.
Continuity mistake: Before the cop climbs on the truck, he shields himself on the truck's cabin and you can easily notice the tarp is perfectly tied by a dozen strings. When he climbs up, all the knots magically untie and he manages to pull the tarp away. His buddy couldn't have done it because he always appears with the gun in his hand, covering him.
Continuity mistake: When Jameson kicks out one of his employees from his office for coming up with another stupid idea, Brock sneaks in through the door into his office, but if you look at the black guy in the office he is holding a piece of paper in his right hand and his other hand is in his pocket, yet in the following shot from inside the office, the black guy is now holding the piece of paper with both hands.
Continuity mistake: In the scene where MJ and Peter are talking in Peter's apartment about her review of her performance, in the first shot we can see all of MJ's hair is at the back, but in the following shot a huge portion of her hair is now over her right shoulder, this happens between shots and we don't see her flick it over her shoulder.
Continuity mistake: In the scene where Marco falls into the sand molecular chamber, if you watch closely when Marco looks up in one shot you can see he is wearing a chain around his neck, yet in the following shot when the lights come on the chain has gone, and then the shot changes to the scientists, then back to Marco where the chain has reappeared on his neck. (00:23:05)