Emma Watson visited Villa Baviera (former Colonia Dignidad) in September 2014. Though the media initially thought she was on vacation, they later found she was doing research for her role.
Following the departure of Augusto Pinochet from the presidency in 1991, Colonia Dignidad renamed itself as Villa Baviera and remained an operational sect until 2007. Residents of the area are allowed entry and exit and the site is presently open to the public for historic tourism.
This movie was filmed in Chile, Luxembourg, Germany, and Argentina.
This is the second film about a dangerous cult that Emma Watson had starred in, following Regression (2015).
The Lufthansa Boeing 707 seen at the end of the film is registered as D-ABOG and named after the city of Bonn, Germany, hence its name "Bonn". In real-life, the airline operated the same type of aircraft and had the same registration and name during the 1970's, albeit that the real D-ABOG was a 707-430, with the film version being a 707-387. To replicate D-ABOG, the production and crew looked through photos of the real aircraft and rented a retired Boeing 707-387 formerly operated by Fuerza Aérea Argentina (Argentine Air Force), which they painted the livery on.