- Dyeing for Your Art: Prior to the film's release, much attention was devoted to Simon Pegg's physical transformation for the film, in which he became extremely lean and ripped, a process which took six months of intense dieting and workouts.
- Fake American: Brit Simon Pegg plays an American in this film.
- Playing Gertrude: A mild example. Morgan has been locked in the bunker for thirty years, and the flashbacks show the younger versions of Morgan, Archer and Catherine to be at least in their early twenties, placing the characters in their fifties during the film's events. Simon Pegg was 48 when filming took place, meaning he would have been in his late teens during the time of the flashbacks.
Trivia / Inheritance