Deliberate mistake: We see the Air Force plane's bomb bay doors come open. But in the next shot of the plane banking, the doors are instantly closed again. (00:45:20)
It Takes a Thief (1968)
1 deliberate mistake in season 3 - chronological order
Starring: Robert Wagner, Malachi Throne
A Thief is a Thief (a.k.a. Magnificent Thief) - S1-E1
Continuity mistake: When Mundy and Claire are sitting in the car outside the apartment building, the rear view mirror has disappeared (probably removed to prevent it from obscuring the actors' faces). It mysteriously reappears later on. (00:42:45)
Noah Bain: Oh, uh, look, Al, I'm not asking you to spy. I'm just asking you to steal.
Alexander Mundy: Let me get this straight: you want me to steal?