Continuity mistake: In the pub scene towards the end when the zombies are taking over, Ed lights up a cocktail, but then in the next shot when zombies break through the door and attack him, the rag is unlit. (01:20:05)
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: 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)
Revealing mistake: You can blatantly tell the pub owner zombie has padding on under his shirt for the pool cue attacks. (01:08:35)
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: 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)
Answer: Shaun's last name is Riley. It can be seen on a poster ad from Shaun's DJ days.