Shot in two and a half days.
The bar at the beginning of the movie, and the night club later on are actually the same place dressed up differently, the cafeteria of Commune Image, in Saint-Ouen.
The entrance to the nightclub was actually shot indoors.
Throughout the three parallel universes they go through, the female characters keep the same color code: Bulle is always dressed in red, Cerise in blue and Douce in green.