A boy is seen being thrown to the ground, flipped, and pinned in wrestling matches. (he is okay every time).
A large boy jabs a smaller boy with a pencil repeatedly, and threatens to kill him if they lose the game of Hangman they are playing (it is not meant to be taken seriously).
Two women (the main character's mother and principal) attack each other after the boy tells his principal that his mom called her a bitch. It is played for laughs. The principal is later seen with her arm in a sling.
Two boys fight, one of them throws the other to the ground and walks away. They later they make up and neither one of them is hurt.
A boy talks about getting a swirlie.
The main character is frequently seen being pushed, shoved, and roughly grabbed by students and teachers.
None of the fighting is at all gory or intense. It is all played for laughs and very infrequent.