In the scene near the end where the two government spooks burst in shooting, Blank and Grocer empty their guns taking them down. Or do they? Blank's right-hand pistol is NOT empty at the time he and Grocer turn to each other and Grocer says "Aww, empty!"; the slide is in the normal position, indicating a round is chambered (compare it to the truly empty left-hand pistol).

To Cusak's great credit, he must have realized there was still a round in the chamber and did not point it at his fellow actor.