Trivia: Midway through shooting, Franchot Tone got into a brawl that left him with facial abrasions on one side so severe they couldn't be covered with make-up. So, in the "glass room" scenes, shots of him are, bizarrely, in profile only or taken from behind barriers obscuring half his face. Some profile shots were reversed to create the illusion that in various takes, we were seeing both sides of him.
Trivia: When the script called for 6-year-old Billy Mumy's character to be found floating in a fountain full of water, the child actor's mother objected, and the scene was changed. Says Mumy, "I wanted to do it. I was a very good swimmer. But Mom was terrified I'd get some weird ideas about suicide if I did."
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Trivia: The most expensive footage ever shot for Twilight Zone occurs here, with the stop-motion dinosaur. The 10-second shot cost $2500 - a fortune in 1960 - and didn't even include having to build the model. The "toy" dinosaur was a borrowed prop from the movie Dinosaurus.