The stuntman against whom Lino Ventura fights is Henry Cogan, the man with whom he fought several years before in a fight during which Cogan broke Ventura's leg. During the fight for the movie, Ventura actually hit Cogan for good in the face saying: "This is for my leg."
Beatrice Delfe's debut.
Obvious product placement for Martini, Ricard and Bière d'Alsace: three alcoholic beverages.
One of the characters says "when men are in the room to talk, chicks have to leave". It was intended to a possibly gay character, who indeed, leaves the house.
The lawyer tells a girl in the kitchen "Don't touch the loot", the title of a previous movie based on Simonin's characters: Touchez pas au grisbi (1954).
Paul Meurisse: The guy with the monocle saluting Lino Ventura at the end of the movie is Paul Meurisse, a reference to the movie The Black Monocle (1961), also by Georges Lautner.