The Night of the Spanish Curse - S4-E14
Other mistake: Very close to the end of this episode during the fight scene, West and Gordon throw a guy directly into the camera - causing the shot to become unfocused and shaky.
The Wild Wild West (1965)
1 other mistake in The Night of the Spanish Curse
Starring: Robert Conrad, Dick Cangey, Ross Martin, Whitey Hughes
The Night of the Bubbling Death - S3-E1
Revealing mistake: As West drags the body of a bad guy out of the scene, the supposedly unconscious man is holding his head up so as not to have his head dragged through the dirt. A truly unconscious person's head would flop back on to the ground.
The Night Dr. Loveless Died - S3-E4
Trivia: Dr. Loveless' uncle's name, "Liebknicht", is, aside from the addition of the letter "k", German for "Loveless".