The film is based on the novel "Nada", by Jean-Patrick Manchette. In fact, while the gang members are discussing the plan in Treuffais' apartment, Díaz notes that the brothel the ambassador should be at is located between Kleber Avenue and Manchette Street. That is a screenwriters' funny idea. In the novel, there is not any Manchette Street, obviously.
Final film of Viviane Romance.
In the Manchette's novel, the description of Commissaire Goémond's character was: a tall man, partly bald, with a mustache and a pear shaped head. If the producers had followed this description, the cast would have chosen Jean-Pierre Marielle for this role. Michel Aumont is however excellent.