Character Pedro Lazcurain is named after a Mexican president who lasted only one day in the job.
When Juan Perez (Damian Alcazar) is interrogated, after being asked his alias, he says, among others, "Varguitas", which was Alcazar's character in a previous movie, "La Ley de Herodes", with the same director, Luis Estrada.
Sometimes, Juan Pérez says the phrase: "Qué paso, qué paso vamos ay", translated literally to: What happened, what happened let's go?. This is pharse that was said by the character Don Ramón in "El Chavo del 8" (1971), coincidentally, Don Ramón is sometimes referred as a bump too, and that phrase can be translate to "What's up?!".