A funny anecdote that happened throughout the filming was the confusion that occurred when they called the 2 Davids (the child actor and the one who recorded the "making of") who shared the same name and same surname. It was always heard: "David Díaz!" and David Díaz (making of) always answered "The tall one or the short one?" But the anecdote was not there because the director Nuria Ferrer liked to address David actor as his character "Miguel" who was also the name of the camera operator.
Filmed in 4 days during 2 whole weekends.
Nuria Ferrer decided to use the 1.90: 1 widescreen format after David Díaz showed her how it was in the TV series Betrayal (2017).