Time Tunnel (1966)
0 deliberate mistakes in show generally
Starring: James Darren, John Zaremba, Robert Colbert, Whit Bissell
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Factual error: When Ulysses opens his mouth while speaking, modern dental fillings are in his teeth.
Visitors From Beyond the Stars - S1-E18
Trivia: The Time Tunnel Homing Beacon used in "The Revenge of Robin Hood" episode is hanging on the bulkhead by the door of the aliens' spaceship.