When Roy first meets Alistair, Alistair is with a girl. When he walks past Roy after the conversation ends, the girl is not with him.
When Roy exits onto the rooftop while looking for Moss, a green Fire Exit directional sign is seen in the background. Despite this, Roy becomes stuck on the rooftop, to be finally rescued by a window washer.
Moss's 8+ club name is Word but during the Street Countdown battle, Prime calls him Moss not Word.
At the 8+ party, Roy is rebuked for requesting a beer as alcohol is not acceptable. However its clear that other people at the party are drinking alcohol (cocktail glasses etc). Though it could be possible that they are drinking non-alcoholic versions of those drinks.