It is said that actor Gastón Coccharale prepare his character by having several meetings with a notorious Argentinean serial killer. For some reason, the actor denies this information.
There was a sixth story that the directors don't talk about. An actor die while reading it and then it was decide to drop the story for its bad vibe.
Tomas Pernich C.E.O. of the VFX house Pernich Co. it is also an actor in the movie. He appears in all 5 stories.