Ben Gazzara was approached to play Commmissario Bonavia, but turned it down. Years later, Martin Balsam thanked Gazzara, since the role had given his career a new lease on life.
Arturo Dominici, who played Avvocato Canistraro, also dubbed Martin Balsam in the Italian version of the film.
Luciano Catenacci's character "Ferdinando Lomunno" was renamed "Ferdinando Dubrosio" in the English dub.