George A. Romero, creator of the movies to which this movie pays homage and lampoons, was so impressed with Simon Pegg and Edgar Wright's work that he asked them to cameo in Land of the Dead (2005) as zombies.
When asked by an interviewer why they chose to have slow moving zombies instead of running zombies, Simon Pegg simply replied, "Because death is not an energy drink."
Simon Pegg and Edgar Wright considered a sequel that would replace zombies with another monster, but decided against it, as they were pleased with this movie as a stand-alone product, and thought too many characters died to continue the story. The proposed title was "From Dusk till Shaun". However, this idea did have an afterlife, a mocked up poster can be seen for the film in Spider-Man: Into the Spider-Verse (2018).
Shaun and Ed's friendship is based on Simon Pegg's and Nick Frost's when they shared a flat together.
All of the newsreaders and television presenters are real people portraying themselves.