Actress Moana Pozzi plays a foreign friend of Manuel Fantoni (Angelo Infanti) and is also the girl pictured on the poster hanging in the room of Sergio (Carlo Verdone) and Marcello (Christian De Sica). It was stated that the flat of Manuel Fantoni was owned by Pozzi, while Carlo Verdone stated that it belonged in fact to a friend of her. Verdone stated also that he decided to cast Pozzi just after having met her while visiting the apartment during the pre-production, while she was a guest by her friend.
The name of character Sergio Benvenuti is a homage both to director Sergio Leone and screenwriter Leonardo Benvenuti, with whom Carlo Verdone had often worked.
Actor Angelo Infanti stated in an interview that the role of Manuel Fantoni was originally written for Vittorio Gassman.
Actor Vittorio Zarfati, who plays the priest of the boarding school, played a hotel concierge in Bianco, rosso e Verdone (1981), also directed by and starring Carlo Verdone.
Carlo Verdone stated that the scene before Sergio and Marcello (Christian De Sica) dance was improvised, as like the gags of the priest (Vittorio Zarfati).