Character mistake: Near the end, just before Derek and Danny depart at Danny's high school, Derek says to his brother "I saw a car cruising by the house last night when I pulled out of there with Seth." The car that was shown driving by their house the previous night was in a brief scene right after Derek and Danny took down all of their nazi posters, and before Derek took a shower. He had not just 'pulled out of there with Seth.' The last time he had seen Seth at this point in the movie was at Cameron's party where Seth had almost shot him.
Continuity mistake: In the opening of the movie, when Derek approaches the black guy who he had just pistol whipped, the background is pitch black with one small light flickering in the distance. Later in the movie, during one of Danny's flashbacks, it shows a repeat of that scene, and when Derek is approaching the black guy, the entire street is well lit, and the background is very visible.
Continuity mistake: Watch Cameron's position when he is hit by Derek. He turns around, bumps onto the wall with his face pointed out left. In another shot after Derek's close-up, Cameron's face is suddenly pointed to the right as he slides down the wall to the ground, without the possibility to have changed his face direction.
Continuity mistake: Just after Danny gets shot at the end of the film, the paper falls directly downward out of his hand to the bathroom floor. In the next shot where he is falling backward, the paper is flying at least two and a half feet in the air higher than it was when it initially left his hand. It showed him releasing the paper just after he got shot without giving it any kind of upward direction.
Visible crew/equipment: When Sweeney and Murray are debating about how to handle Danny after the stunt he played in class, look closely at the bookcase behind Sweeney. You will notice a reflection of an object, likely a piece of equipment, hovering up and down above Sweeney's head. While it is difficult to make out what this object is, it is definitely something that would not ordinarily be there.
Continuity mistake: Just before Derek and Danny take down their Nazi posters, they are gazing at the wall. Danny, in one shot is sitting in his chair looking upward with his hands in his lap. In the next shot of what appears to be uninterrupted time, he is looking downward with his hand raised up to his face.
Continuity mistake: When Danny gets home from school on the day of Derek's return, he shows Derek his Disciples of Christ tattoo on his arm. Watch Derek and you will notice that he first grabs Danny's wrist with his right hand, and then in the immediate following shot of completely uninterrupted time Derek is holding Danny's wrist with his left hand.
Continuity mistake: Watch behind Danny when the principal tells him to shut the door to his office. Right before he says this, on the wall behind Danny, there is no reflection of the sun. When the shot cuts back to Danny we can see a large reflection behind him on the wall from the sun.
Continuity mistake: When Seth is spitting the jelly beans out of his mouth, he has them all over his shirt. But in the next shot when Derek comes into the room and Seth gets up, there are none on his shirt.
Continuity mistake: When Derek is talking to Danny in the kitchen about the stunt he pulled in school, the lamp above the kitchen table goes from being still to moving side to side between shots.
Continuity mistake: When Derek is first telling the story about his time in the jail they show Derek with the top button on his shirt buttoned up and the next shot the cop tells him to button up his shirt and the top button was unbuttoned. (01:09:15)
Continuity mistake: After Derek stamps the car-jacker's head into the curb it shows the dead body with his head on the curb. It cuts to Derek, Danny, police then goes back to the dead body. His head has somehow slipped off the curb and is now behind it.
Visible crew/equipment: When Derek is entering the party with Seth you can actually see the shadow of the camera and of some crew members on Derek's and Seth's bodies. It just takes a sec, but I think it's clear.
Continuity mistake: When Danny is walking into the principal's office he is not quite in the door when the shot goes to Sweeney and he says to 'shut the door', then the shot goes back to Danny who is about two feet farther in the door than he was when he stopped in the last shot.
Continuity mistake: When they go into the coffee shop they order a coffee, a large milk, and a maple bar. Then when Sweeney and the cop walk in Derek goes to talk with them without taking the order. He tells them that he is going to take him to school and calls Danny over. Danny doesn't come close to the counter but when they walk out the door Danny has the order in his hand.