Just before it was recorded, Gareth Hale had shaven his moustache off and Gareth and Norman decided to do a final sketch where they get into an argument over Norman wearing a false moustache. Still, it was interesting to see Gareth without his mostache. It may had shocked some viewers, but it was mostly played for laughs.
I've just bought the series 1-10 boxset and it has 5 episodes for season 10... unless one of the other discs with the specials counts as the 6th and 7th episodes