Audio problem: At one point during Doug and Tony's hand to hand combat with the Union soldiers, the traditional Hollywood sound of a fist smack to the face is heard as Tony blocks a blow with his arm, instead of the sound of a thud.
Time Tunnel (1966)
1 audio problem in The Death Merchant - 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.