Ximena Sariñana, who plays Renata's sister, Mariana, is director Fernando Sariñana's daughter. Ximena also sings several of the songs on the film's soundtrack.
Fernando Sariñana: [pumas soccer team] Good guys are Mexico's Pumas Football team fans. Ulises wears a Pumas jersey. This is a very expensive item in Mexico, so as the character is poor, he uses a "pirate" (illegal copy) jersey.