The Édith Piaf song "Non, je ne regrette rien" is used as a plot device. Marion Cotillard played Piaf in La Vie En Rose (2007). Christopher Nolan has stated that this is "pure coincidence". After Cotillard was cast, Nolan intended to change the song to eliminate speculation on the subject, but composer Hans Zimmer persuaded him to keep it.

Film

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