The parking lot scene was inspired by the documentary short Heavy Metal Parking Lot (1986) about heavy metal fans outside a Judas Priest concert.
Filmed in 16 days.
The scene at the fire pit was originally scripted to take place in the living room of the house. This was changed when they discovered the fire pit at the filming location.
In the original script, Alexis' stepmother is her biological mother. The third act is more elaborate as well.