At the beginning of the movie as the main character leaves the breakfast table he puts on his jacket. The back collar is up; seconds later the collar has moved back in proper position.
The movie takes place in 1989. In France all the cars had yellow headlights. White headlights were legalized in 1993.
Near the parking lot where Jean Marc Faure lives, we see, several time, a Volkswagen Golf III. This model was built and put on the market in 1991, yet the movie takes place in 1989.