"37,2 Le Matin" - the French title of the film, is a woman's body temperature in Celsius, when she is ovulating.
During the early days of Netflix's DVD service by mail, this was their number one requested foreign language film.
The color Blue appears in almost every shot throughout the film.
The yellow jacket worn by lead Jean-Hugues Anglade was discovered in a Parisian flea market by the film's costume designer Elisabeth Tavernier who purchased it for less than $5.
The opening beach scenes are Gruissan, near Narbonne.
Frédéric Andréi: When in Paris, Betty briefly goes to the rail tracks and Jules, the postman played by Frédéric Andréi in Diva (1981), also directed by Jean-Jacques Beineix, can be seen walking past her.