Catherine Spaak's first leading role. She got her big break when her uncredited brief appearance in Le Trou (The Hole, 1960) caught the eye of a Paris TV reporter. Sophia Loren happened to see the reporter's interview with Catherine on TV. She immediately thought she looked perfect as Francesca in this film which was being cast by her producer-husband Carlo Ponti.
Director Alberto Lattuada was a friend of Catherine Spaak's father. He tried to cast young Catherine in his movie for years but was refused by her father saying she was too young. He finally gave in when she turned 15 on the condition he would return her in one piece.
The film score was composed by Piero Piccioni, one of the future leading Italian film score composers. He was a suspect of the infamous 1953 Wilma Montesi murder case. Montesi was a normal Italian woman from a proper family. Her dead body was found on a beach near Rome. Piccioni was later acquitted. The murder remains unsolved. The investigation exposed the drugs and sex orgies of Roman high society at the time and inspired Federico Fellini's La Dolce Vita.