Dustin Ardine had to drop over 70 pounds in a very short amount of time in order to play the role of John. Dustin Ardine had packed on massive weight for his previous role in the feature film Ariadne (2018). He achieved this by going on the Master Clense Diet for over 2 months straight and did not eat any solid foods the entire time until Birth (2018) wrapped.
The house that John, played by Dustin Ardine, and Amy, played by Isabel Serrano, live in is the same house used in Insidious (2010).