Continuity mistake: After Ed and Shaun pull up to Phil and Barbara's house, the garbage bins move around by the time the zombie falls backwards onto them. (00:40:30)
Continuity mistake: The field in front of Liz's flat is large and unfenced. Yet, when Shaun climbs up to her window, there is a fence not more than ten feet away. He couldn't have run round the side as the sound of the zombies are coming from the same direction. (00:46:25)
Continuity mistake: In the beginning when Shaun is at work and is talking with Liz on the phone, when they are done he puts the phone down. Two cuts later we see him putting it down again. (00:11:20)
Continuity mistake: At the Winchester, Liz knocks zombie John's eyeglasses off, but then it is back on his face only to be knocked off again. (01:12:45)
Continuity mistake: Just after Liz and Shaun have come out of the cellar, the shot zooms out and you can see a few people behind them trying to get into the pub. In the following shot the number of people trying to get in has increased. (01:26:25)
Continuity mistake: When Shaun and Ed are looking upstairs for Pete and Ed is about to go up, Shaun stops him with his arm. At first his arm is under Ed's hand. When it cuts, his arm is over Ed's hand. (00:34:00)
Continuity mistake: When Dianne tosses the tennis pole to Shaun, the coil at the end of it is facing towards him. When he catches it the coil is facing away from him.
Continuity mistake: Shaun's "To Do" list, which he writes on the whiteboard, changes. He doesn't write an exclamation mark, and he swipes the marker pen through the word "OUT." However when we see it the following morning when he awakes, there is a exclamation mark after the word "OUT", and the lines he drew through the word "OUT" have moved and are now underneath the word. (00:24:05)
Continuity mistake: In the cellar, Shaun lights Ed's last cigarette and it appears to have barely caught on one side. The next shot, the cigarette's burned down evenly about half a centimetre, which means it's a different one from the one he lit before. (Tried this with a real cigarette before submitting. They just don't burn like that.). (01:25:50)
Continuity mistake: In the scene where Ed smashes the ashtray on the zombie's head, his right hand goes to pick up the ashtray. In the next shot, his right hand is empty and in the close shot of the zombie we see the ashtray in Ed's hand again. (00:30:50)
Continuity mistake: Mary (the checkout clerk who later appears in Shaun's garden as a zombie) works for a fictional supermarket chain, "Landis." But in the opening montage, all the till screens display "Welcome to ASDA" (Asda is a real chain of supermarkets in the UK). (00:03:35)
Continuity mistake: When the shells are firing off in the bar fire, there are three shots of the box of shells. The box refills itself between every shot. (01:21:25)
Continuity mistake: The red ink on Shaun's pocket at work changes from a solid blob to one with a few spots above it back to solid. (00:09:50)
Continuity mistake: When David is pointing the rifle at Barbara and Shaun, you see the barrel of the rifle and David's hand holding it. When the camera moves so you can see David's face, his hands are higher up on the barrel. It's the same when the camera switches between these two shots again while Shaun and David are arguing. (01:14:25)
Continuity mistake: In the yard, when Shaun stabs the blue robe zombie, the metal pole still sticks out of his chest a good 4-5 feet, but when Dianne gives her zombie acting lessons the pole barely sticks out of the zombie's chest. (00:56:30)
Continuity mistake: The red ink stain on Shaun's shirt pocket disappears and reappears repeatedly throughout the film.
Continuity mistake: When Shaun and Ed are threatening David, close ups of David's face show the bottle and corkscrew both being pointed from his left when Shaun and Ed are standing on opposite sides. David is also facing right in wide shots but left in the close ups.
Continuity mistake: In the first shot where we see Ed on the couch playing a video game and Shaun walks in, there's an ashtray of a baby wearing a sombrero. A few shots later, it's gone.
Continuity mistake: During Shaun's second trip to the newsagents, he slips in liquid (no doubt meant to be blood), however once he gets home and he puts his feet up, the soles of his shoes are perfectly clean.
Answer: Shaun's last name is Riley. It can be seen on a poster ad from Shaun's DJ days.