Vicente Aranda discovered Bibí Andersen doing a similar show to the one she does on the movie and like her so much he wrote the role for her (hence both being named Bibi).
Based on a real story.
Many roles in the film are played by actors members of the same family: Manuel Gas and Mario Gas (father and son), Vicky Peña (Mario Gas wife) and Montserrat Carulla (Vicky Peña's mother).