Other mistake: When Nick and Shawn are on the bus leaving the cheer camp, the old man in the seat behind them is mouthing their lines.
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. (00:02:25)