Trivia: Shaun's mum calls Shaun "Pickle" because that's what Writer/Director Edgar Wright's mum used to call him.
Trivia: When the gang come across another group made up of identical characters, that may be all the entertainment many people get out of the meeting. However, they're all stars of fantastic UK comedy shows, many with links to stars of this film - The leader is Jessica Stevenson, star of Spaced, which also starred Simon Pegg and Nick Frost from this, and was directed by Edgar Wright, who also directed this. Behind her are Martin Freeman from The Office, which also starred Lucy Davis (Dianne in this), Reece Shearsmith from The League of Gentlemen, Tamsin Greig from Black Books, which stars Dylan Moran (David in this), Julia Deakin, also from "Spaced", and Matt Lucas from Little Britain. Not that that's all they've done, but to list all their mighty comedic achievements would take far too long - check them all out on the IMDb. Comic geniuses (genii?) the lot of them.
Trivia: Nick Frost had a patch of his hair shaved to show how Ed was the kind of guy to pass out at a party and have stuff done to him, but it's also a reference to Arnie, who had a bald patch after T3 and explained to the press how he shaved it for a part in a movie, so Nick Frost shaved his for a part in this movie.
Trivia: As the gang shuffle towards the pub, in one or two brief shots of the zombie mob, one of the zombies is dressed exactly like the character Tyres (a bike messenger) from "Spaced", and in fact is played by the same actor, Michael Smiley.Keep an eye out for some bright blue and yellow clothing.
Trivia: When Simon Pegg says "he's not my boyfriend." in the pub, then promptly calls Nick Frost "babe", that's a gag which also featured in their TV show "Spaced".
Trivia: The (fictional) supermarket chain that the zombiefied Mary and Noel work for is called "LANDIS" (you can see it on their name badges). This is a nod to director John Landis: Simon Pegg has mentioned in interviews that Landis' An American Werewolf in London was an influence on this film. It's also very similar to "Londis" - a chain of shops in the UK.
Trivia: While Shaun is feeling depressed, Ed is telling him his drinking plan for the next day. Listen out for clues to subsequent events: "Bloody Mary" - Checkout Girl, "Bite at the king's head" - Phillip, "Couple" - David and Di, "Little Princess" - Liz, "Stagger back" - impersonate zombies, "Bar For Shots" - firing rifle. (00:18:45)
Trivia: The shots where Dylan Moran is being torn apart by the zombies look almost identical to the deaths of two of the soldiers in Day Of The Dead.
Trivia: When Shaun jumps on the trampoline to get over the hedge, it's a reference to the SNES game Zombies Ate My Neighbours. Simon Pegg does a version of this in all 3 films in the Cornetto trilogy.
