Producer Alfredo Leone and the director's son, Lamberto Bava, shot new scenes, changed the ending, and changed the music in 1996, releasing the film under the title of Kidnapped. Both versions are available on DVD.
Don Backy/'Aldo Caponi' (Who played Bisturi (Blade)) was a successful singer/songwriter in Italy during the 1960s. He was part of the music group "Clan" founded with singer/actor/director Adriano Celentano.
One of the robbers is called Bisturi (Blade). His weapon of choice in the movie is a knife. Another Robber is called Trentadue (32) which is a reference to his penis size in centimeters. The final Robber is called Riccardo, the same first name as the actor who plays him.
Often mistakenly is considered an influence on Reservoir Dogs because of how the movie is based around the after effects of a heist. The film wasn't released till 5 years after Reservoir Dogs. Quentin Tarantino has said that Mario Bava's Black Sabbath influenced Pulp Fiction, however.