Helena Fernán-Gómez was dubbed in post-production by Pedro Almodóvar, because he could fake a more feminine voice that Zulueta wanted for the character.
Editing took 6 months, and the first cut was 180 minutes. Producer Augusto Martínez Torres loved it but knew it was impossible to premiere like that. After battling a bit with Iván Zulueta, they managed to produce the final cut, which is 110 minutes long.
Both the shooting schedule and the budget grow over the production.
The final sound of the machine gun was an idea by Eusebio Poncela. He has express his regret later for that suggestion, arguing the other idea of Iván Zulueta was better and gave the ending a different meaning.