Guest stars DeForest Kelley and Grace Lee Whitney, who would soon both be regulars on Star Trek (1966), appear in this episode - but have no scenes together.
Bobby Troup, composer of the hit song "(Get Your Kicks on) Route 66", was married to producer Jack Webb's first wife, Julie London, and was the stepfather of Webb's children, Stacy Webb and Lisa Webb. Troup would be one of the stars, along with his wife, of Webb's TV series Emergency! (1972).