Continuity mistake: In a deleted scene (available on the DVD) between Will and Marcus in Will's flat, we get to both see and hear clips of Countdown on Will's TV set. The errors are with the utilisation of Countdown for this sequence: The way it's laid out it doesn't just work like that on the Countdown programme itself. On the deleted scene in question, the countdown clip starts with the theme, when we next see it on Will's TV it's on a word game with the clock music running, then a couple of minutes later we hear that the clock music has started again but there's been no new selection of letters or numbers. When Marcus sits back down again at the end of the scene the starting theme tune for Countdown begins again.
Continuity mistake: During the hospital scene, after Suzie asks, "That right Will?", we see behind him in the background, a lady with a green skirt, presumably a nurse, but then when Will says, "So your mum's gonna be okay", we now see two men in green where the nurse was, then cuts to Marcus, then to Will again, but now we see the lady again. After that Suzie arrives and the men in green are back.
Continuity mistake: When Marcus' mom is crying and getting his breakfast ready, Marcus asks if he should get his own breakfast, and his mom says "No, I'm doing it." While she says this, she's opening the box of cereal, but then it shows her pouring and spilling the carton of milk, with cereal already in the bowl.
Continuity mistake: When Marcus and Will are playing pool, there are a couple of shots of Marcus and there are a few balls on the table in front of him. However, a few shots later, there are more balls and they have all completely changed position even though they both haven't taken a shot or touched the table.
Continuity mistake: In the last scene where Hugh's character and the two boys are sitting on the couch, Hugh gets up to go to the kitchen, taking his remote with him. In the next shot of just the boys the remote is lying on the table in front of where Hugh's character had been sitting. In the next shot when Hugh is coming back he's carrying the remote back with him.
Continuity mistake: After Fiona is told that Marcus has been going around to Will's place she goes and interrupts Will's date at a restaurant. She later sits down to talk to Will and there is a side angle of her and a frontal angle. In one of the angles her necklaces are outside her shirt, in the other angle, they're tucked into her shirt.