Character mistake: When Will tries to quote the law to the barman, he states that the group must be "accompanied by an adult" in order to drink alcohol with food. However, since he just served Jay, he believed Jay was an adult; and Jay is accompanying the group. Both Will and tha bartender miss this.
Continuity mistake: When Will says "Sir." to Mr Gilbert in the pub (after Gilbert says "I'll make sure you get another badge for this"), a man in grey trousers and a blue jacket can be seen standing inside the pub at the top left of the screen. Not only is everyone supposed to have left the pub at this point, but he wasn't visible in the previous identical shot of Will. (00:19:51)
Visible crew/equipment: As Mr Gilbert is talking to will, a reflection in the jukebox can be seen of some form of audio equipment. (00:19:38)
Continuity mistake: When Simon sits down with Carlie and Tony, they're just getting their drinks, and Will begins arguing with the barman about his ID. In the next sequence of shots, Carlie and Tony have finished their drinks and are leaving - but Will is still arguing about his ID. How long has the barman been putting up with him for?
Answer: Jay, Si and Will steal Simons dad booze as they are planning on meeting Carly later on and have lost their own supply when kicked out of Neil's place by his dad after being caught and insulted.