Revealing mistake: At the very end of the film Clint's corrupt boss drives away from the docks. He does this at a certain speed. Just before the time bomb goes off the car goes at a much slower pace and also Clint's boss has changed into a dummy.
Revealing mistake: After the pool massacre, a police cop walks away from the scene and we see the pool with dead bodies. If you look carefully, you can see a "dead" woman in a red bikini moving her arms as if she was treading water.