Wissenswertes

Sir Ringo Starr wrote and recorded a title song but it wasn't used in the movie. It was released as the B-side of his hit, "Back Off Boogaloo".

In the short documentary Looking For Richard (2015), Lloyd Battista recalled that this movie's production was "the most fun" that he and Tony Anthony had while making a movie, recalling that "Everything that usually goes wrong (went) right. We were blessed because we were so relaxed", and described Ferdinando Baldi as a gentleman. He noted that he, Tony, and Sir Ringo Starr would spend their off-time on Ringo's private yacht, smoking joints in a back alley, and eating "two dollar or three dollar" meals at restaurants that were also frequented by Peter O'Toole and Anthony Quinn.

Based on the Japanese character of the blind swordsman Zatoichi.

This movie was refused a U.K. cinema certificate by the BBFC in February 1972, before being passed with heavy cuts four months later.

Pedro's asking of Blindman if he can sing or play guitar (to which he responds with "no" to both) is likely a reference to Tony Anthony's unsuccessful and short-lived career as a singer/songwriter.