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.
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.
Except for some exteriors in Paris, Geneva, and Singapore the film was mostly shot in Madrid.
Carlos Santos gained 10 kilos and shaved his head partly, for the role or Luis Roldán
Most of the interior airport scenes were shot either in university buildings in Madrid or in abandoned malls.