Taissa Farmiga and Ben Rosenfield were cast over a Skype call.

A script did not exist for the film. An outline was considered the ''script,'' with descriptions for the scenes and visuals in the outline.

The second time Taissa Farmiga and Joshua Leonard have worked together. They previously worked on Vera Farmiga's directorial debut Higher Ground (2011).

The second feature film Hannah Fidell has written and directed. Her first was A Teacher (2013).

The second time lead actors Taissa Farmiga and Ben Rosenfield have starred in the same film. They also appeared in Jamesy Boy (2014), but did not have scenes together, nor did their characters interact with one another.

Lindsay Burdge's second time working with Hannah Fidell. She previously starred in Fidell's first feature film A Teacher (2013).

Will Brittain was originally cast to portray the role of Peter in the film, but had to drop out at the last minute.

The second time Ben Rosenfield has played a character named Dan.