Starring: Robert Conrad, Dick Cangey, Ross Martin, Whitey Hughes
The Night of the Druid's Blood - S1-E24
Continuity mistake: After the first freeze frame, West is trapped in a pit. The camera angle from above shows him standing on a pail with his arms extended upward - so he can hold on to the beam - as he is waiting for the fuse to thrust him upward. At the moment the fuse propels him upward, the close-up shows West's arms down at his side, but as he is ascending towards the beam his arms are extended upward.
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".