Near the end of the film, when Derek and Danny are outside of the school, there is a man in the background with a green handkerchief on his head sitting. As shots alternate, he is standing speaking with a group of people, and then sitting alone again.
When Derek is confronting Cameron in his office at the party, the shadow of the boom mic is clearly visible on the wall and on the floor on the right side of the screen, following the actors as they talk.
When Seth is spitting out the jelly beans just before he and Derek are about to leave the Vinyard home, you can see assorted colors shoot out of Seths mouth. Although, just a second before, the bowl was filled with all white jelly beans and one black ones until Seth picks out the black one and tosses it.
When the family is fighting around the dinner table and it gets so bad that everybody is standing and yelling at each other, Derek's mom pulls on his shirt, opening up several snaps or buttons. When the scene is ending, Derek opens up his shirt by pulling it open quickly, but all of the buttons or snaps are closed again for this effect.
When the police officer is pulling Derek off the ground after the shooting, he has his right arm over Derek's chest. In the next shot, he has his left arm, and then in the next shot his right arm again. (This is the second flashback to this incident, occurring about 1 hour into the film.)
The first time when Derek was stacking the sheets, he threw a stack of sheets onto the shelf behind him, where they lay all disorganized. In the next few seconds, the sheets that had been thrown keep changing positions, and the piles of sheets on the table change positions between shots.
In the flashback to Dennis Vinyard's death, it is stated that he was an LA County Firefighter. In the flashback scene with Danny at the breakfast table, Dennis Vinyard has an eagle on the badge. The Los Angeles County Fire Department has a bear on the badge. The Los Angeles (city) Fire Department has an eagle.
In the beginning of the film, when Derek runs out of the house and finishes shooting at the thief stealing his truck, in slow motion he turns around facing the camera, with the gun still in the same hand he was using to fire it. Later on in the movie, when this scene is replayed from a different shot, he turns around and puts the gun in his other hand.
After Danny is shot, we see his essay "fly" out from his hand and to the right of his body. When Derek goes into the bathroom there's a close-up of the paper on the same side of his body, but after we see Dr. Sweeney and then go back to Derek and Danny, the essay moves to the left of Danny's body.