The opening sequence with Matt O'Leary and Jessica Cook driving to the mansion wasn't in the script. Cook and O'Leary had to be flown back to Germany for the filming of this additional scene.
During the basement scene, a quick shot of the fertilizer containers reveals the brand name Trioxin, the same chemical that reanimated corpses in RETURN OF THE LIVING DEAD.
Writer Adam Aresty came up with the idea for the story while working as a caterer at an outdoor party with a severe wasp infestation problem.