Continuity mistake: In the scene at Hardy's house party, Keith pushes Hardy up against the wall at the bottom of the stairs, and two of Hardy's buddies immediately grab Keith and pull him off. But the guy on the left changes. In the shot where he first gets grabbed, that friend is a guy with a slight curly-haired mullet and a dark flannel button-down shirt. Seconds later the shot shows a guy with long bangs and a dark sweater... a completely different actor. It remains this actor for the rest of the scene.
Continuity mistake: In the beginning of the movie the school is named San Pedro High School, but later on it's San Paulo High School. (00:08:20 - 00:21:20)