Revealing mistake: The camera films Tony's P.O.V as he enters the sports club to kill Peter and Susie. As the camera nears some door, it goes out of focus, and then the picture refocuses.
Revealing mistake: When Tony stops the robbery at the grocery store, he punches the guy holding the gun. You can see that his fist does not connect on this punch, but the robber reacts as though he had been hit.
Revealing mistake: When Pete is lying dead in the hot tub, he is also visibly moving his arms and legs, treading water.