Mike's lacrosse stick is actually a girl's stick. Boys' sticks have a much deeper pocket and they are strung differently.
When Alex is making fruit kebabs, his boss says Spencer needs a hair net. But Alex's hair is not in a net and that would also be a violation.
When the girls are in the woods going to destroy the file, Aria throws the file up in the air. At first it's in normal speed, then it's slowed down. When it's slowed down, you can see Aria speaking but no audio coming out. It was probably the line she said before.