Visitors From Beyond the Stars - S1-E18
Revealing mistake: The view of the town seen through the saloon doors is a painted backdrop, as some of the actors cast shadows against it.
Time Tunnel (1966)
1 revealing mistake in Visitors From Beyond the Stars - chronological order
Starring: James Darren, John Zaremba, Robert Colbert, Whit Bissell
Factual error: When Ulysses opens his mouth while speaking, modern dental fillings are in his teeth.
Trivia: The same prop used as the Time Tunnel homing beacon in "The Revenge of Robin Hood" and part of an alien ship in "Visitors From Beyond the Stars" makes an appearance in this episode.