Peter von Kant wants Romy Schneider in one of his movies. Fassbinder wanted Romy Schneider to star in "Die Ehe der Maria Braun", finally giving the role to Hanna Schygulla.
Peter von Kant mentions that a movie company turned down "Tropfen", a reference to a Fassbinder play that ended up being made by Ozon, who also directed 'Peter von Kant'.