Revealing mistake: When the Air Force Officer says "There is, of course, no doubt that their plan succeeded" during the search operation press conference, the puppet behind him can be seen moving its mouth in sync with the dialogue as well.
Thunderbirds (1964)
1 revealing mistake in The Impostors - chronological order
Starring: David Graham, Ray Barrett, Peter Dyneley, Shane Rimmer
Revealing mistake: When the dummy plane is shot out of the sky by the fighter pilot, a piece of the plane shoots off into the top left of the screen and bounces off the sky background. (00:23:05)
Trivia: Although he is the main villain, the Hood appears in only six episodes throughout the entire series.
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