It's possible there's a slight error in the title or year. Perhaps:
* The title is misspelled. Could it be "I Don Giovanni della Costa Azzurra" or something similar?
* The year is incorrect. Could the film be from a different year?
* The film is less well-known. It might be a niche or regional film that doesn't have extensive online documentation.
To help me find the right film, could you please:
* Double-check the title and year.
* Provide any other details you might remember about the film, such as the plot, director, or other actors.
Once I have more information, I can try to find the film and provide you with the cast list.