There are several references in this movie to Michel Gondry's various music videos. Carrying the piano up the stairs is a reference to his video for the artist Lucas's song "Lucas With the Lid Off" which features a very similar sequence. The dolls that Gael García Bernal pulls out of the desk during one of the Stephane TV sequences are from his video for Oui Oui's song "Les Cailloux". The White Stripes song in the soundtrack is a reference to the many videos Gondry has done for them. The giant hands in an early dream sequence are from the Foo Fighters' "Everlong" video. Stéphane's bed and porch are similar to those from Chemical Brothers' "Let Forever Be" video.
Michel Gondry didn't use any chroma keys in this film (excepts the one you see explicitly in Stephane TV), but he screened the FX sequence (already done before the shooting with step-by-step method) behind the actors, so that they could see it and not imagine it, which gives them a different way of playing their parts.