When the movie gets to the part where the kids and Mr.Walker are waiting at the Hotel for the person who left the letter for Mr.Walker and the guy trips Mr.Walker, watch closely, as the kids are running over to see if Mr.Walker is ok, Lexi's friend (the girl) is laughing. Is it really that funny to see your Teacher fall, well I think so, but after many takes of this scene, you would think it would lose it's humor. I don't know if you will catch it but it's pretty easy to spot!