The Key House exterior and interior is completely built from scratch by Netflix.
The pilot was originally shot for streaming service, Hulu, who decided to pass on the pilot, and it was then picked up by rival streaming service, Netflix.
Kinsey's head mall is the same as Starcourt Mall from Stranger Things, another Netflix show.
Tom Savini, who the"Savini Squad" takes their name from, plays the hardware shop clerk who gives Bode the jar of keys.
Jackson Robert Scott (Bode) also acted in the 2017 remake of IT and its sequel; IT was created by Stephen King, whose son Joe Hill is the creator of the comics on which this show is based.