Continuity: The positions of the fencing school students supposedly standing still behind Greg change constantly between shots as the instructor addresses them.

Revealing: The stolen green sedan has normal windows in exterior shots. But in all the closer views (shot in-studio and processed with rear-screen projection), the car has no glass in its windshield.

Continuity: Greg pulls Christine into the alley. When he says, "It's no good," he's standing squarely face-to-face with her. But in the very next shot, he's moved to a side-on position with his head turned toward her.