The character Chrissy is named after Chris Higgins, the "Final Girl" from Friday the 13th: Part 3 (1982)
Chrissy coins the term "Roy Burns" to reference the men pretending to be famous killers. This is a reference to the character Roy Burns, who famously pretended to be Jason Voorhees in Friday the 13th: A New Beginning (1985).
Mother's email says "Walk nicely and quietly, and do not run off the path." These are the same directions the mother gives to Little Red Riding Hood when sending her to her grandmother's house in the short story "Little Red Riding Hood".