In the scene where Marlon and Bobby play beer pong versus Tad, the scene cuts back and forth between shots to show the two teams. The shots repeatedly show a full set of cups, as if the game hadn't started yet, despite showing multiple shots where both sides had drunk some of the cups, revealing editing errors.
Roller skates would not be allowed on a wood gym floor.
Right after the first basketball game, Byron buys a Pepsi in a bottle out of the machine in the school hallway. He pops the bottle cap off using the opener on the machine, but when he brings the bottle up to drink, the level in the bottle is already down several inches, indicating this was a re-take of the shot.
The Spanish teacher mispronounces the word "página."