The dialogue from the last scene of the fictional play is taken from this Truffaut's previous movie, where Catherine Deneuve also plays a woman named Marion.
When Catherine Deneuve tells Virginie Ledoyen "to look at you is both a joy and a pain", this is a to François Truffaut's movie, in wich Jean-Paul Belmondo tells Deneuve the same exact line. That line was also referenced in Truffaut's Le Dernier Métro, this time told to Deneuve by Gérard Depardieu.