The red guitar Sean finds is a reference to The Driller Killer's guitar-drill in Slumber Party Massacre II (1987).
The pillow fight sequence is a reference to Slumber Party Massacre II (1987).
Every film in the "Slumber Party Massacre" franchise is written and directed by women.
Most of Russ Thorne's dialogue is lifted directly from the original film. His wardrobe and mannerisms are also nearly identical.
Breanie's "Space Baby" shirt is a reference to Kim's shirt in The Slumber Party Massacre (1982).