When Carlos says "We've got 10 minutes before we go back and María finds out", there are 10 minutes remaining in the film.
Entire film was shot over the course of 10 days.
Stephen King praised the film, describing it as "horrible and also horribly funny. Think the Coen Brothers' darkest dream".
Director/co-writer Caye Casas shares first name with two characters in this movie, the baby Cayetano and the salesman. Co-writer Cristina Borobia shares surname with the protagonist.
María mentions that the baby's toys are his father's childhood toys. The toys are indeed from the time Jesús would have been young - the original Masters of the Universe, Teenage Mutant Ninja Turtles, Sesame Street, the Smurfs, Star Wars' X-Wing, and Juegos Reunidos Geyper (Industrias Geyper does not even exist anymore). They are in great condition, considering that Jesús played with them and his brother broke one.