This was David Díaz first short film for the I.O.R.T.V. School of Cinema, the second and last was Ridiculus Mortis: Solo la muerte se flipa 2 veces (2007). And first to be done recorded in Betamax tapes.
Carlos Ureña replaced Carlos Román who couldn't repeat his role of Jesús (from The Fear (El Miedo) (2006)) because he couldn't come the first day of shooting.
The first shot shown in the short film was actually the first shot to be done. The last shot was Paula Pascual shot in the last sequence.
A line was lost during the filming. Just after Silvia abandons the library, Bertucho says "See that?". That line was actually "See that? She even agree with me".
David Díaz: Appears in the back of the back as the picture of the author, Donald Dennis Hall. He wanted to appear as an extra, but teachers didn't let him do it, so he made that photo. In the film sequel, that character was played by Manu Monteagudo.