Revealing mistake: The car that goes over the cliff is at least ten years older than the car it's supposed to be - the 1957 Plymouth Fury that Diamond was driving. It's obviously old 1940s stock footage.
Revealing mistake: When Diamond and Miss Miller are driving in the country, Diamond is turning the steering wheel in wide arcs as though he's on a winding road. But the rear-screen projection footage behind them is moving in a straight line.
Revealing mistake: During the fistfight at the end, David Janssen's stunt double's face is visible several times. (00:23:30)
Revealing mistake: Diamond's office building has an automated push-button elevator (quite a rarity in the 1950s). But when he and Hastings exit and walk into the hall, the elevator doors remain open long after they should have closed. There's also no break in the floor where the steel plating for the lift car ought to be, making it all the more obvious that it's a studio mock-up rather than a real elevator. (00:01:20)
Revealing mistake: When Diamond is driving with Ted, his wife and their dog in his convertible, the rear-view mirror, which was there earlier, is missing. The shaky rear-screen projection makes it even more obvious that the car is a studio mock-up with the mirror removed to make the actors' faces more visible.
And Whose Little Baby Are You? - S4-E18
Revealing mistake: The $100 bills Diamond picks up from the table are very obviously not real. The stage money's rather frilly design pattern looks vaguely like some currency from the 19th Century, but it doesn't resemble anything in circulation in the 1950s. (00:06:30)
