At the end of the film, when the character of Seydou urgently leaves the building, it is another actor than Benjamin Sanou who is running. This is Sebastien Lopes, an amateur actor who was originally chosen to interpret the role. The crew had started shooting with the latter, but on the 3rd day, during the "pursuit race" with the civilian cops, he tore his muscles, preventing him from continuing shooting. That's how Benjamin Sanou joined the film.
The elevator of the film is really an elevator of one of the buildings in the Bourdonnette district. The elevator had to be temporarily blocked for a few scenes.
During the shooting, more precisely when in her scene, Nicole Mersey destroys the piano with a club, the noise was so loud that one of the parakeets of the neighbor upstairs died....