The film closes with a dedication to Ryan McHenry - McHenry, who sadly passed away in 2015, wrote and directed the short film Zombie Musical (2011) from which this feature film was adapted.
One of the posts seen in the #EvacSelfie bit was from "Ash Campbell" - a mashup of Ash Williams/Bruce Campbell from the Evil Dead franchise.
During the scene when Lisa sings her song at the school's Christmas concert, the man seen playing keyboard is Tommy Reilly, who co-wrote the music for the film.
This movie has 3 versions: the USA cut, which is 93 minutes long, the UK/International Cut, which is 98 minutes, and the Festival Cut, which is 108 minutes.
The movie was planned to have a full musical opening scene featuring a drunk Santa stumbling though the town center while the people around him sung "What a Time to be Alive". This scene would also feature several minor characters before they are infected, however the scene was canceled halfway though shooting due to poor weather conditions.