Even though the real "Monnezza" only appeared in two films as such, the very similar cop character Nico Giraldi, also played by Tomas Milian in many other films, was to be continually identified as "Monnezza" by the public.
Pietro Torrisi , in addition to playing one of Brescianelli's henchmen, also appears as one of the participants in the bar room brawl in the film-within-the-film that the prisoners watch at the beginning.
Italian censorship visa # 69002 delivered on 27-8-1976.
In the Italian version of the movie, the opening credits contain a typo in which the screenplay is credited to Umerto Lenzi instead of Umberto Lenzi.