Factual error: While firing their muskets at the guards as they rescue the Dauphin, Tony and Doug each quickly discharge their weapons twice without reloading. Muskets are one-shot weapons that required immediate reloading after firing.
Time Tunnel (1966)
1 mistake in Reign of Terror
Starring: James Darren, John Zaremba, Robert Colbert, Whit Bissell
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.