Robert Z'dars character is named "Sheriff Arkin". The name "Arkin" was inspired by a character of the same name from the film "The Collector".
At the restaurant scene there is a couple named "The Vernon's", the characters are an homage to the writer/directors love of the film "Behind the mask: the rise of Leslie Vernon"
Ari Lehman portrayed the first Jason Voorhees ever in "Friday the 13th" (1980). His character is a postal worker named "Jason" in Easter Sunday. A fun nod to the iconic role he portrayed.
Jason Delgado and Travis Morton both received hits to their head from breakable glass bottle and both received actual cuts and scrapes as well as lumps on their heads for their efforts.
This movie is heavily inspired by Italian horror cinema. That's why the killer focuses on ruining his victims eyes in closeup shots