Screenwriter Laurent Zeitoun got the idea of the film from something that happened in his family, when one of his cousins was in love with someone who didn't treat her well and he told his uncle that they should hire an actor skilled in improvisation to split up the couple.
The piano player is played by Caroline Duris, Romain Duris' sister. She is a talented pianist and already played for her brother in Der wilde Schlag meines Herzens (2005)
Es geschah in einer Nacht (1934) was one of the films that inspired screenwriters Laurent Zeitoun, Jeremy Doner and Yoann Gromb.
Pascal Chaumeil's feature film directorial debut after a lot of TV work and over a hundred commercials on his belt.
Early in the film when Juliette mocks Alex's suit he says that it's by the designer Paul Smith. Later in the film, after the piano concert Alex can be seen packing his laptop into a Paul Smith laptop case.