In an interview with Variety Magazine, director Rodrigo Pla explained that the reason for some scenes, which at first seem neutrally observed but are then revealed to be witness testimonies in a future court case brought against Sonia due to her actions, was because that's the same narrative that the source novel uses and that this helped balance the story. He said if the story had only been revealed from Sonia's POV, the audience would feel immediate empathy with her, so the multiplicity of POVs helps to fairly balance out the story.
Jana Raluy, who plays Sonia Bonet, stated that her father had died of cancer shortly before filming began and this helped her emotionally with developing her character.
Laura Santullo wrote the screenplay based on her novel by the same name of the film and is the wife of director Rodrigo Pla. She has written the screenplay for all four of his full length feature films.