Revealing mistake: When the sheriff's car is flipped upside down, the sign behind the car is upside down too, so you can tell the car isn't really upside down.
Revealing mistake: A helpful guy is holding a jar supposedly holding the fish that were recovered after the tank was cracked open by the shot. You can tell however that there's no fish in it and Susan Saint James is dropping a handful of nothing in it. (00:21:00)