Mia shoves an ice cream cone down the front of Lana's cheer uniform as an act of revenge.
Mia has some sort of bandage on her nose, but takes it off suddenly when the boy she likes comes into the room. She is visibly in pain (implied with facial expression; no audible reaction). Her nose is noticeably red where the bandage was, but no blood. After the boy leaves, she says, "Ow."
A teenaged boy steals a kiss from Mia in an effort to garner attention from the paparazzi, and she hits him in the head with her sandal.
Mia accidentally hits her gym teacher in the head with a softball. Her gym teacher walks away with her hand on her head, calling for someone to get ice.
Mia feels nauseous while giving a speech in front of her class. She starts heaving and gagging while rushing out of the classroom. It is implied that she vomits.
Mia's car rolls backwards down a hill after the emergency brake fails, and she crashes into a trolley. Nobody is injured.
A man's sleeve catches on fire during a formal dinner and is dunked in an ice bucket to extinguish the flame.
A cheerleader mocks Mia by pretending to vomit while making a loud gagging noise.
Mia hits a baseball during gym class and the ball hits one of her classmates in the groin, causing him to fall to his knees in pain. Since he's a school bully, he most likely deserves it in the film.
A woman is very clumsy and falls down a lot (mostly played for comedy.)