Guest stars Charles Drake and Anne Francis have previous sci-fi experience. Drake played the sheriff in "It Came from Outer Space" as well as Commodore Stocker in *Star Trek* and Francis played Walter Pidgeon's daughter in "Forbidden Planet."
John Carter (Dabney Coleman) and Joe Bonning (Robert Knapp) are said to have gone to school together. But Knapp was actually 8 years older than Coleman.