The show was inspired by the Men's Adventure pulp magazines.
Whenever there are subtitles, the actors' lips are speaking the English words in the subtitles, while the audio is being dubbed over in another language - usually German.
The show often incorporates miniature sets, buildings and vehicles, paying homage to tv shows of the 1970/80s, which used very obvious miniatures.
The jacket that Colonel Chessbridge wears during the "briefing" scenes (black with white trim) is nearly identical to the jacket worn by Number 6 in "The Prisoner" (1967). That series is a pseudo-sequel to "Secret Agent" (1964) also known as "Danger Man".