Matt Smith auditioned for the role of Will, but lost out to Simon Bird. Iain Morris recalled - "He was brilliant - down to the last two for Will, I think. I think he was a bit too dashing! That's why he'll be brilliant in Doctor Who (2005) - he's got something sort of heroic about him. He had the humour, but what I think Simon Bird has got is a sort of vulnerability and so when he's doing these terrible rants at people, you know he's the loser! Whereas there's something very leading man and heroic about Matt Smith."
There are only two scenes over the entire show which do not feature at least one of the Inbetweeners; in Season one episode six, Mr Gilbert is talking to himself after the school prom. And in season two episode two, Will's Mum and Neil's Dad have a meeting with Mr Gilbert about their sons work experience.