Mauricio Aznar (1964 - 2000) was the lead singer and composer of the Zaragoza rock bands Golden Zippers, Más Birras and Almagato.
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.
Many members of the Carabajal family played their own relatives at the time when they met Mauricio.
Filming started in Spain in March 2020 but had to stop after 3 days due to the COVID outbreak. It resumed in Argentina in November 2022 and then they went back to Spain to finish in February 2023.