In 2006, a clip from this movie (Moschin comes back to the disco where Barbara Bouchet is dancing) has been used by group Vinylistic as video-clip for their song "Record Player".
Fernando Di Leo admitted that, with a critical eye, the scenes at the Police Station among the "fascist" Commissioner and the "communist" Mercuri should be taken off because they take strength out of the main story. But the work of actors Frank Wolff and Luigi Pistilli was so good that he couldn't absolutely cut it off.
Many of the people who plays minor character like the men of Rocco Musco weren't actors but people really taken from the street.