- Actor Allusion: A bunch, mixed in with the rest of the Shout Outs:
- "Get away from her, you bitch!"
- A really old one for the fans, Graeme is a very good artist.
- Clive bites The Big Guy on the forearm.
- Paul gets his marijuana from the military.
- When the police officer in the gas station asks Graeme and Clive about guns in the UK, they respond that farmers have guns. Presumably farmers' mums, too.
- Specifically Clive says that police don't shoot people but Graeme admits that they just avoid shooting people. Guess which actor played the reluctant, gun-toting bad-ass in Hot Fuzz...
- A Hellboy comic can be seen on display during the end credits scenes. Jeffrey Tambor who portrays Adam Shadowchild has starred in the Hellboy movies as Agent Tom Manning.
- Awesome, Dear Boy: Sigourney Weaver jumped at the chance to appear in the film as she felt it was a love letter to science fiction fans and a genre that has been very good to her in her career.
- Playing Against Type:
- Production Posse: This is the fourth project Simon Pegg and Nick Frost have starred in together, following the TV show Spaced and the films Shaun of the Dead and Hot Fuzz.
- Reality Subtext: At the end, Pat tells Ruth that she would look even better with her clothes off. The actress who plays her, Jane Lynch, is a lesbian.
- Stillborn Franchise: A sequel for the film, entitled Pauls, was considered until prohibitive costs ruled it out.
- What Could Have Been:
- Pegg and Frost had wanted Yeardley Smith for the role of The Big Guy, but she turned them down.
- They had also originally imagined Danny DeVito as Paul. They originally felt an older actor like Jack Nicholson or Rip Torn would be ideal for the voice, but when the studio suggested Seth Rogen they liked the idea, due to Rogen's distinguishable voice.
- Edgar Wright was supposed to direct, but he had to drop out in order to direct Scott Pilgrim vs. The World.
- The Big Guy was originally written as a man.
Trivia / Paul