Because the film takes place over the course of one night, the entire production consisted of night shoots. The average day of production began with a 6pm call time for crew, and wrapped around 6am.
The store owner mentions the "Bowers and Marsh Farm," referencing the characters from Stephen Kings IT, Henry Bowers and Al and Baverly Marsh.
A news reporter is named Rebecca Chambers, a reference to a character from the Resident Evil video games.
The three production hard drives were all named after known clowns: Pennywise, Bozo, and Pogo. During post-production, one more was added: Krusty.
The last day of principle photography took place at a traveling carnival in Oconto Falls, WI, hometown of director Adam Krause.