The film takes place on December 30th, 2014 to January 1st, 2015 in Wichita, Kansas. The reason the date is so specific is because in July of 2015 (around the time the film was being shot) a new law had gone into effect in Kansas where it was no longer required to have a license to own a gun. This of course would have made the whole conflict of the film less of an issue.
Principal photography took a total of 6 days in July of 2015. Afterwards, there were 5 days of re-shoots and additional filming in the month of August. The film was shot in a total of 11 days.
The roles of James and Marty (the two guys in the grocery store break room) are portrayed on screen by Tyler W. Moore and Christopher Strong, their voices are provided by Jack HF and Joey Crozier.
Chelsea's last name is revealed to be McDowell on her bottle of lithium.