Rehearsals: Took 2 weeks and the Director Sam Reyes construct the relationship of Luis and Andrea. Improvising, they had their first meeting, kiss, fight and special moments.
Trained dog: After finishing shooting the dog of the movie died, he ate a poison ham.
Pre-production: The director planned the movie in bed, sick, before a surgery of the partition and the quinsy together. He experiment the terror of pain and suffering, it inspired him to get the right mood to the movie. It took 2 weeks to recover from it and reading the book "Directing actors" from Judith Weston.