After The Impossible (2012) and Ocho apellidos vascos (2014), this film topping the 2015 Spanish movie office charts will also mark the third year out of four that a Spanish film tops Spanish box office charts.
Production was rushed by producer Paolo Vasile when a TV show with a similar premise, Allí abajo (2015), was announced and went into production.
(at around 20 mins) Rafa uses the names of well-known celebrities in Catalonia to improvise the list of his 8 Catalan surnames: Guardiola (after Pep Guardiola, soccer player and coach), Adrià (after Ferran Adrià, chef), Serrat (after Joan Manuel Serrat, singer), Pujol (after Jordi Pujol, former President of the Generalitat de Catalunya), Caballé (after Montserrat Caballé, opera singer), Cobi (actually not a person, but the name of the mascot of the 1992 Barcelona Olympic Games, a Catalan sheepdog), Messi (after Lionel Messi, who is in fact Argentinean, yet star player of FC Barcelona soccer team for more than 15 years), and Codorníu (mispronounced as "Condorniú", a brand of Catalan cava).
A scene in which Antonio Resines and Carolina Ferre were playing a married couple was eliminated due to pacing reasons. Ferre said it was a "silent cameo" that did not add much to the film.