This episode has the biggest Guest Voice Cast throughout the entire series of Stingray.
Duke Dexter is portrayed by the same puppet who played Colonel Steve Zodiac in Fireball XL5 (1962) and was previously seen in the series as Johnny Swoonara in Stand by for Action (1965).
The yellow hover scooter that the messenger uses later appears in Martian Invasion (1966) as the smoke machine.
In production order, this episode shows the last appearance of the WSP Commanders.
The Announcer puppet has previously appeared as the Newsreader in Tom Thumb Tempest (1965). He was also seen in the bar during the episode Deep Heat (1965).