The film was shot entirely with an iPhone 7 Plus camera.

The movie was shot in just 10 days.

The film was shot entirely on the iPhone 7 Plus in 4K using the app FiLMiC Pro.

The budget was only $1.2 million according to 'The Times', UK.

Steven Soderbergh's first horror/thriller movie.

Hospital scenes were filmed in Pomona, NY at the Summit Park Hospital that recently closed.

During the scene where Nate leads a group discussion in the common room, Steven Soderbergh's film Full Frontal (2002) is playing on a TV in the background.

The film had its world premiere at the Berlin International Film Festival on February 21, 2018.

Body Count: 5