Continuity mistake: When Peter is home watching the news, he grabs his cell phone and places his thumb on the screen. In the close-up it's away. This swaps back and forth. (01:00:35)
Continuity mistake: When Peter spots Gwen on the street he stops a truck that stops 20 cm away from him. When the angle changes the truck is further back. (00:45:40)
Continuity mistake: When Harry and Peter talk by the river they're alone in the wide shot, but with a couple to the right in the close-up angle.
Revealing mistake: During the plutonium heist, when the truck skids, tire marks from previous takes are visible on the pavement. (00:10:20)
Continuity mistake: After Spidey fixes Sam's hair he puts his hands on his ears. When the angle changes the hands are gone. (00:10:05)
Continuity mistake: When Rhino walks towards the cops he is a meter away from two cars. From the aerial angle he is 10 meters behind, moving towards the cars again. (02:09:50)
Continuity mistake: Before Peter googles Roosevelt he drops stuff on the floor. The position of the objects changes drastically between shots. (01:01:20)
Continuity mistake: In the kitchen with his aunt, Peter drinks from a mug. From the opposite angle the arm is lowered.
Continuity mistake: When Gwen is summoned by her parents to take a graduation family picture she says to Peter she'll work "all night long" and places her left hand on Peter's neck. When the shot changes her hand is gone. (00:16:30)
Continuity mistake: After graduation, when Peter kisses Gwen he places his hand on her cheek. When the shot changes the hand is gone. Also, her hair is covering her cheek or perfectly brushed depending on the angle. (00:16:25)
Continuity mistake: During graduation, after Peter tell his aunt "Ralph Waldo Emerson" he takes his hand to his hair. A shot later the hand is lowered. (00:15:15)
Continuity mistake: When Peter greets Aunt May during graduation a bang of hair over her left cheek appears/disappears randomly between shots. (00:15:00)
Continuity mistake: While confronting Rhino, before Spidey tosses the loudspeaker there are two cops to his right, and two other cops 4 meters behind. He throws the loudspeaker backwards, which in no way could've been grabbed by anyone. When the shot changes the cops on the right are magically behind Spidey, ready to catch the loudspeaker. Furthermore, its movement is totally unrealistic, revealing it's a CGI image with a fake movement to allow for the cop to grab it. (02:12:15)
Other mistake: When the little boy confronts Rhino, before Spidey arrives there's an aerial shot of a police car. There's not a single piece of glass inside despite the massive shooting and the shattering of all of its windows. (02:10:15)
Continuity mistake: After Spiderman saves Max and gives him the blueprints, Max's hairstyle keeps changing between shots, several shots before Spidey fixes his hair. (00:09:50)
Continuity mistake: Mary is touching Peter's face when her husband takes her away. She bends her arm to her chest, but in the following shot it's back next to Peter's neck and she is repeating the previous movement. (00:02:25)
Continuity mistake: When Gwen is giving her speech, in the background are two boats passing. In the next shot they disappear. (00:12:50)
Continuity mistake: When Stan Lee is in the audience of the school ceremony, in the close up somebody is on his left but in the open view that person is gone. (00:14:20)
Continuity mistake: When Aunt May is about to do the laundry she gives Peter a sandwich with a large piece of lettuce in it, but in the following shots the lettuce disappears. (00:26:40)
Continuity mistake: In the scene where the power is out and two planes are on a collision course with each other, the microphone of one of the air traffic controllers changes from a correct position facing his mouth, to an incorrect position hanging way down and away from his mouth, between shots.
Answer: Peter could have contacted the police anonymously.
MasterOfAll