According to production manager Vicente Sempere, playwright Miguel Mihura wrote nothing or next to nothing of the screenplay, and was hired just to put his name in the credits because of his prestige.
According to the documentary Filmmakers vs. Tycoons, the movie was re-release and adapted to Cinemascope format, even if was not the original format. Luis García Berlanga didn't know that until they showed it to him in the documentary's interview.
The film was declared "de interés nacional" (of national interest).
Voted fifth best Spanish film by professionals and critics in 1996 Spanish cinema centenary.
When the film was presented at the Cannes Film Festival, the production company had the idea of distributing $1 bills with the images of José Isbert and Lolita Sevilla in place of George Washington.
When the script was submitted to the Censors, it was approved with a scene cut, the school teacher dream of her encounter with the American, for its erotic and political content. Therefore, the scene could only be filmed fifty years later by director Luis García Berlanga as a short, El sueño de la maestra.