The last film made by Catherine Spaak before she turned 20. She portrays a young woman in the film but she was by definition still a teenager at the time.
Janine Reynaud who plays the real Silvana in this film would go on to gain a modicum of fame in several European sexploitation films in the late 1960's and early 1970's. It was her debut in this film.
The catchy "whistling" soundtrack is performed by Daisy Lumini. She was an Italian composer, singer and stage actress. Her husband was struck by terminal cancer and lost his speech. In 1993, on the day of her birthday, they committed suicide together by jumping from a viaduct under construction.