The Night of the Feathered Fury - S2-E17
Revealing mistake: The string used to make the rattlesnake's head move is visible.
The Wild Wild West (1965)
1 mistake in The Night of the Feathered Fury
Starring: Robert Conrad, Dick Cangey, Ross Martin, Whitey Hughes
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".