- Two color episodes were produced as part of a season that was interrupted when McGoohan quit the series to make "The Prisoner." These two episodes were edited together to form the movie Koroshi (1968). The original unedited episodes were released on video in the UK in the 1980s.
- The series was originally broadcast in the UK and Canada as "Danger Man." For American broadcast, new opening credits and a new them song - the hit "Secret Agent Man" by Johnny Rivers - was added. The original theme was "High Wire," a piece of music that can be heard following the opening credits in most episodes.
- Besides the theme song, other changes were made to the credits between the UK and US versions. In the UK version each episode starts with a very brief opening credits sequence introducing Patrick McGoohan. The teaser follows, and then after the commercial break the rest of the theme (High Wire) is heard as episode credits roll. The US version eliminates pre-teaser credits (except in the very first episode), inserting the "Secret Agent Man" credits after the teaser in the usual location (for US programs).
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