Trivia: There is the use of a hand in the same frame of a puppet in this episode, as in the castle a human hand (Southern's) can be seen playing with a pen while the puppets of Kenyon and Dempsey can be seen in the background.
Trivia: When Prescott is driving in his car on his way to the Hudson Building, look in the background and you can see a building with a large white Swastika on it.
Trivia: When Prescott is driving along in his car, he is humming the song "Marina" from "Stingray", another Gerry Anderson show.
