Mauricio Aznar (1964 - 2000) was the lead singer and composer of the Zaragoza rock bands Golden Zippers, Más Birras and Almagato.
Many members of the Carabajal family played their own relatives at the time when they met Mauricio.
At the beginning of the movie, Mauricio is watching on TV a documentary about Atahualpa Yupanqui (born Hector Roberto Chavero), one of the most important Argentinian singers. He is played by his own son, Roberto Chavero.