The idea of the Bukraken originate on June 26th, 2016, David Díaz was in a party meeting with the people of the Spanish improvisation group "W.I.T.". They where talking for a long time about an improvisation that Arantxa Blázquez performed weeks before, in a improvisation game called "Theatrical Death", in which the audience must choose a place and an object where the improviser must die. And that night they told her that she had to die inside a Kraken, with a sticker of Julen Lopetegui (a former soccer player). That improvisation was so funny that it came up again in conversation that day. Until a moment that afternoon when, in the words of David Díaz: "Someone said "Bukake!", another said "Kraken!", and suddenly, someone we don't remember who said "Bukraken!" We all fell to the ground laughing. We were making fun of that word for a while. And days later, I thought... It might be fun to create something with that word." And the rest is history.
Although there was a narrative development of the story, carried out based on the questions that followed a "beginning - middle - end", all the actors improvised all their interviews.
There is a post-credits scene.
A total of 14 hours and 21 minutes (861 minutes) of footage was recorded for the movie. 10 hours and 40 minutes (640 minutes) only for the improvised interviews, 2 hours and 10 minutes (130 minutes) for the sect and the therapy scenes, and 45 minutes only for the footage around the world.
According to David Díaz, in order to develop the story he was inspired by the Monty Python's sketch "The Funniest Joke In the World" (on the episode Whither Canada? (1969)), the mockumentary What We Do in the Shadows (2014) and the documentary miniseries Shoah (1985). The first 2 served to inspire him to create that universe of false historical documentary in the absurd genre. And with Shoah (1985) he used the same shooting method when conducting the interviews. Made without cuts, leaving the parts intact when the interviewees collapsed and cried in the middle of a scene; and the fact that historical footage was never showed.