Belinda Lee was killed in an auto crash between Las Vegas and LA the same year this film was released. She and Vittorio Gassman were speaking English in this movie.
When Reginaldo and Fra Bartolomeo go visit Il Caparra, the theme from Federico Fellini's "La Strada", which was also composed by Nino Rota, can be heard.
Italian censorship certificate # 34288 delivered on 30-3-1961.