While filming the church scenes, production was shut down various times for a tornado, a possible fire and a power outage.
There are numerous cult symbols hidden throughout the movie.
The cast and crew shot 27 locations in 4 1/2 days while in the Dominican Republic.
The filmmakers have said they approached the movie as a "creepy thriller" and "unsettling love story" rather than a horror movie, which is how the film was marketed by Fox.
The characters, Officer Miska and Detective Zeman, are named after Brad Miska and Zak Zeman, who produced the director's previous work on V/H/S (2012).