During Casturelli's hallucination of a deer in the airport the actual deer on set relieved himself in one take. Alberto Rodriguez himself helped mop up in order to shoot the next take.
A subplot involving investigative journalists is completely cut out from the final film
When filming at the famous Ritz Hotel in Madrid the film crew was notified that the actual ex Minister Belloch was currently renting a room out in the building. They never came into contact however.
Carlos Santos gained 10 kilos and shaved his head partly, for the role or Luis Roldán
Except for some exteriors in Paris, Geneva, and Singapore the film was mostly shot in Madrid.
Most of the interior airport scenes were shot either in university buildings in Madrid or in abandoned malls.
Since they couldn't afford stand-ins, the camera trainee would be used instead. He normally doubled for Marta Etura and other women in a scene since he was the youngest crew member.
As a wrap gift to all crew members the production design team gave out fake bills with the Alberto Rodriguez's face and the name "paesetas" below.
Some scenes got to be filmed in the real Ministry of Justice building in Madrid. Notably Belloch's press conferences
Cameo: the AD and Still Photographer dressed as French police in the background of the passport control of the Paris airport scene.
All the cigarettes smokes by actors are real tobacco cigarettes. Some actors would go on to smoke 3 cigarettes a scene.
Director of Photography Alex Catalan is known for having many takes. This resulted in some shots having 12-14 takes.
Alberto Rodriguez retained most of his crew from his previous two films La Isla Minima and Grupo 7
The title is a slight variation from the book the film is adapted from "Paesa, el espía de las mil caras" (Paesa, the spy of a thousand faces)