The movie was shot with a special film which didn't require much light on set, as Totò already had serious health issues to his eyes which would eventually lead him to near-blindness.
Both director Sergio Corbucci and actor Vittorio De Sica used to work at this movie on afternoons, because in the morning they where busy with other works: Corbucci with Romulus et Remus (1961), De Sica with Boccace 70 (1962).
Italian censorship certificate # 36234 delivered on 5-12-1961.
Originally the plot had to be about the rivalty between a public security marshall and a Carabinieri marshall working to the same case. The censorship made the plot being totally changed.
The wife of Achille Pennica ( Gianni Agus ) is played by Nori Corbucci, wife of movie director Sergio Corbucci and costume designer of this movie.