Completing the family affair casting, Anthony D. Call is the son of this show's director, Abner Biberman. Call and co-guest star Mark Goddard would go on to fame in outer space within a couple of years: Goddard as co-star of the popular series Lost in Space (1965), Call in a memorable shot on Star Trek (1966) as the helmsman who freaks out during The Corbomite Maneuver (1966).
This is the second of three appearances Tom Palmer makes in the series, each time playing a different character. The other two appearances occur in Glass Tightrope (1963) and The Judgment: Part I (1967).