The idea of a night radio show comes from an actual radio show called "Les choses de la nuit" ("The things of the night", in English) with Jean-Charles Aschero, which lasted on France Inter from 1976 to 1996 and was broadcasted from midnight to 5 AM. One of the segments was called "Quel est ton prénom ?" ("What's your first name?"), where someone hidden from the host would reply to questions after promising to answer them truthfully (except, ironically, their first name). Director/writer Mikhaël Hers remembered that show from his childhood and integrated it in his script.
Most of the action is located in the XVth arrondissement of Paris, in the Beaugrenelle neighborhood, which was built in the 70s.
Some of the very period-looking shots were filmed with a Bolex camera, whose grain instantly makes everything look old, even modern cars.