Character mistake: When the two main characters are approached by the coach in the school, they make a bet on how many times the coach will say sh*t, the coach says it 9 times, but Nick says that there were ten.
Other mistake: In the scene where the boys are getting off the bus at cheer camp, the bus behind Nick and Sean is letting the kids out of the bus the wrong way. The film is reversed - the Tiger shirt of the girl stepping out is even backwards.
Other mistake: In the beginning of the movie when Shawn and Nick are jumping into the pool, Shawn is on the left side and Nick is on the right. When they are in the pool, Shawn is on the right side and Nick is on the left.