The opening scenes on the beach were shot on a freezing cold day in January.
The girls on the poster do not appear in the film.
The Slumber Party Massacre trilogy is the only slasher series to have not only all female directors, but all female writers as well.
After filming was completed, the leftover set was used for another Roger Corman-produced sequel that was unrelated to its predecessor: Sorority House Massacre II (1990).