Frankie Darro, who played jockey Billy Arnet, was the uncredited performer inside Robbie the Robot in "Forbidden Planet (1956)".
Actor Robin Morse, who played Ned Parks in this episode, died of a heart attack at the age of 43, on December 11, 1958-- three days before the episode aired.
At 1:54 Gunn is driving his car with license plate NVZ 669. The plate does not have the name of an issuing state.