This episode was originally scheduled to air on November 22, 1963 but it was preempted by the coverage of the assassination of President John F. Kennedy.
This was the final episode for three actors who'd guest-starred at least three times on the series: Yvonne Craig, James Seay and Bill Quinn.
Six years later, guest stars Bruce Dern and Yvonne Craig would be teamed up as time travel police in an episode of Land of the Giants (1968) titled Wild Journey (1970) that seemed to be intended as a pilot for an Irwin Allen sci-fi spin-off series that didn't sell.