The film is dedicated to Yann Samuell's parents-in-law Gerard and Sonia. Gerard and Sonia lent their house to Yann Samuell while he was writing the screenplay. The two were killed in a car crash a week before the film was released.
Marion Cotillard and Guillaume Canet played a couple in this movie and in 2007 they started dating. In 2011, their first child was born. The two actors didn't met on the set of "Love Me If You Dare", it happened years before starring together in the movie and they were friends since the '90s.
When Julien is at the cemetery on the day after which he and Sophie haven't seen each other for ten years, he wishes Sophie would just appear and sing "La Vie en Rose", a song by Édith Piaf. Marion Cotillard (Sophie) would later win an Academy Award for playing Piaf in La Vie En Rose (2007).
After playing the daughter of Polish immigrants Sophie Kowalsky in this movie, 10 years later Marion Cotillard played another Polish character in The Immigrant (2013), Ewa Cybulska.