The decision was made by the filmmakers to move the movie away of the previous "found footage" tropes (such as the use of a framing device, a linear narrative and a non-recognizable cast) and into a story "told through cameras that exist in the world of the characters" much like Chronicle. This is demonstrated throughout, including the deliberate absence of a framing device, the use of an animated opening quote, a recognizable cast, a non-chronological narrative structure and a final music cue that is playing in the taxi becomes the end-credits song.
The trivia items below may give away important plot points.
The faces of only four members of the cult are visible in the film. In order of appearance: the cab driver, the cult "leader" (who can be seen in the psychic shop, in the neighborhood they walk through on the way to the club, and inside the underground club speaking with the cab driver), the man watching from across the street when they return home, and the couple's second doctor (Dr. Dylan).