Two sequels were planned, and written by Chris Quinn, but never came to fruition. A prequel was made called Life Before the Apocalypse (2012), which was written and directed by Chris Quinn and features some of the original cast. He has since disowned the film.
In part five, Ryan begins to tell his back story although nobody asked him.
Ryan's line about Milkshake needing medication was cut short due to disagreements between Chris Quinn and Ryan Solomon, who were both involved in post-production.
All of the cast unanimously hated the Diet Orange Crush that Ryan gave to them.
As there was absolutely no script written for the production, the actors often stumbled on their dialogue. Noah Lubell says 'um' and 'uh' 45 times throughout the film, while Brandon Pruitt was the only cast member to never say the words.