Continuity mistake: When Shaun goes to the newsagents after the dead rise, he gets a drink out of the fridge, which has blood-stained hand prints on. He slips on what we assume is blood as he walks away, yet on the way in and as he leaves the shop you can see behind him that there is no blood or any other liquid on the floor. (00:25:35)
Suggested correction: Have just watched this on the big screen, and there is definitely blood on the floor. It's on the red tile, so it is hard to see; also hard to see on the DVD version.