Starring: Robert Conrad, Dick Cangey, Ross Martin, Whitey Hughes
The Night of the Vicious Valentine - S2-E20
Revealing mistake: The red-headed villain falls face first into the wedding cake. The front of his face is covered with cake and icing. West "punches" him on the face - but punches are not real - that is why West has no cake or icing on the fist that "punched" the face covered with cake and icing. (00:46:30)
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".