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 was inspired by the Men's Adventure pulp magazines.
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".