The Film-in-Film sequence "Voodoo Zombies from Skull Island" combines scenes from "Vampire City 2: Rock 'N Roll Zombies from Outer Space" (2009) and a new scene that was filmed especially for this movie.
The scenes with Julia Prock-Schauer as Karen are taken from "Lost in Vienna, Austria" (2013).
Actor Seth Raven has a mustache in one scene, in the next scene he is clean shaved and in the next scene he wears his mustache again.
When Lt. Brick Dexter shows his ID it shows into his direction.
In the scene when Jaimie Cutter walks into the basement and puts her sunglasses on you can see the cameraman in the reflection.