The original novel revealed the murderer at the very beginning; the film opted to reveal it at the end. In addition, the film's killer in the film was not the same one as the novel.
Food for the film was created by master of nouvelle cuisine, prominent premiere French chef Paul Bocuse.
Changes from the film's source novel included the ending and the removal of a lot of the book's erotic material.
Playing a pompous gourmet in this film was Robert Morley who due to the popularity of the character went onto make a series of successful television commercials for Heinz soup. Morley was awarded Best Supporting Actor from both the National Society of Film Critics Awards (1979) and the Los Angeles Film Critics Association Awards (1978). Morely was also nominated in the same category at the Golden Globes.
The movie's source novel actually gave the recipes for each dish.