Attack of the Alligators - S1-E23
Revealing mistake: When Gordon shoots the third giant alligator, you can see a bit of water jumping into the air at the very end of the shot, indicating that it was reversed footage.
Thunderbirds (1964)
1 revealing mistake in Attack of the Alligators! - chronological order
Starring: David Graham, Ray Barrett, Peter Dyneley, Shane Rimmer
Continuity mistake: When Scott is in the cockpit of the Mole, he has two blue tubes in the holsters of his belt. But when he is cutting through the fire doors, the tubes have changed to one blue and one yellow.
Trivia: The shot of Thunderbird 2 flying in the dark is actually reused footage from a previous episode, "The Man from MI5."