Factual error: "Kemo" is in the kitchen preparing food while everyone is studying. We see him putting raw meat (brains) in a pan, and then in real time we see him having a discussion with Pancho, and Pancho walks out. Kemo then says the food is done and asks if anyone wants some - but there's been no more than 60 seconds since he put it in.
Continuity mistake: In the scene in the classroom, when the new student comes into the class with a slip to give to the teacher, he takes the slip from her. Then, the scene cuts to Lou Diamond Phillips following his gang leader out the door. Then, the very next cut, the teacher takes the slip from the student yet again, and tells her to have a seat in the empty desk in the back.