During the film, Ed tells Shaun that "Snakehips" is always surrounded by women. Later in the film, we see Snakehips being devoured by 3 female zombies.

The running gag about dogs not being able to look up was inspired by a theory that Nick Frost came up as a result of an incident that occurs in the second series of 'Spaced', a show starring Shaun Of The Dead's Frost and Simon Pegg, both directed by Edgar Wright. In a scene from Series 2, Episode 6, Daisy bangs on the window in Marsha's room and shouts for Colin, he looks round. However, he looks directly behind him rather than up where Daisy is, at the second floor window. Whether or not the theory has some truth in it, the reason behind the scene was this. The shot of Colin is from Daisy's viewpoint from the second floor window, whereas when we see Daisy it is shot from outside on the ground looking up. The sound made to get the dog to look round was made off camera at ground level. This is explained on the Shaun Of The Dead DVD cast commentary.

In the scene where Shaun, Liz, and Ed are beating the zombie with the pool sticks, Shaun falls to the floor at one time and does a little Matrix-style move to get himself up back on his feet. Shaun perfected this move in real life in his dance team named 'The Galaxians'.

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' "American Werewolf in London" was an influence on this film. It's also very similar to "Londis" - a chain of shops in the UK.

Shaun's mum calls Shaun "Pickle" because thats what Writer/Director Edgar Wright's mum used to call him.

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.

Shaun's second walk to the shop is only one shot, and took 13 takes to achieve.

Throughout the movie, Ed can be seen playing the video game Timesplitters 2. As a possible way of saying thanks, the line "You've got red on you" was given to a zombie in the third Timesplitters game, Timesplitters 3 - Future Perfect.

When Shaun is going to the shop to get a Cornetto, there is a radio in the background saying something about a satellite exploding. A reference to Night of the Living Dead, when the explosion of a probe returning from Venus was the explanation offered for the zombie outbreak.

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".

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.

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.