The principal theme of the soundtrack is based on Los pekenikes's song Embustero y bailarín (Liar and dancer).
Bruno and Nino drive the exact same model of Mercedes, and their license plates are consecutive.
Director Alex de la Iglesia made a cameo as a staff member on a tv show
According with Santiago Segura, in the first takes that they filmed in which Bruno slaps Nino, El Gran Wyoming slapped him so soft trying to not hurt him, that the takes weren't valid, and they had to repeat them. In consequence, Segura was softly slapped several times, and was himself who insisted Wyoming for slap him hard.