The Mustang had a fairly easy filming schedule regarding its locations, as the whole film took place at a prison. The 2019 film is based on a real-life rehabilitation program. In the film, Schoenaerts' character Roman is in prison for beating up his wife so badly that she now suffers from brain damage. While the film's story is fictional, the rehabilitation program that teaches prisoners to train wild mustangs is a real program across Arizona, California, Colorado, Kansas, Nevada, and Wyoming.

While some films see actors and crews traveling to different states and countries to get the perfect shots, The Mustang was shot in one location, as Roman was not allowed to leave the prison. Despite the protagonist's violent past, Schoenaerts' acting allowed fans to resonate with and have compassion for his character, especially when Jason Mitchell's Mustang character is murdered by his addict cellmate. Roman's connection with his horse...