The director's father performs as Zapata, the bouncer at the club that wouldn't let people in. He was named Zapata after the alikeness with the famous Mexican revolutionary.
The production was very close to be canceled because of technical problems with the 16mm cameras. Three different cameras had to be rented in a period of three days. The first two didn't even make a shooting day.
The hospital sequence was actually shot in just one take because the emotive performance of the actors captivated the director who decided it was the one.
The guy with Ramon in the last club scene is actually the production coordinator Jesús DLeón Serratos. His character was named Adolfo after the short's screenwriter.