Continuity mistake: When Gwen is free falling, her hair moves wildly except for the part where she is about to be crushed by two pieces of concrete, where her CGI hair is completely still.
Continuity mistake: Eddie's watch switches hands when he's being taken over by the symbiote.
Continuity mistake: In the scene where Marko falls into the molecular chamber and the machine starts up, turning his insides to sand, we follow pieces of sand into his left hand but, going in the same direction we went in, we come out of his right hand.
Continuity mistake: In the scene where Spider-Man is being given the key to the city, the view as the camera sweeps the band, it shows a full row of members on the top left, but when you see the band from the park angle (during MJ's conversation), there are less band members.
Answer: At one point in time, Sony was set to make "Spider-Man 4" with director Sam Raimi and stars Tobey MacGuire and Kirsten Dunst. However, Raimi was unable to find a script he was satisfied with after many months of working with different writers, and he was having issues with the studio attempting to force the film into a 2011 release date, which he felt wouldn't give him the time he needed to make a quality film. Thus, he and the actors dropped out and the studio instead opted to go ahead with a reboot, in the form of The Amazing Spider-Man.