The Night of Miguelito's Revenge - S4-E12
Visible crew/equipment: The wire suspending Pike's flying butterfly bomb is visible as it flies around the circus tent.
The Wild Wild West (1965)
1 visible crew/equipment mistake in The Night of Miguelito's Revenge - chronological order
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".