Lee Mack's son Arlo McKillop guest starred in the 2013 Christmas special Not Going Out: The House (2013).
An pilot was made featuring Catherine Tate as the landlady. It was not broadcast.
Tim was originally intended to be a biker with a stubby beard, but was deemed too scary to be the accountant posh lad.
Arlo McKillop's dad, Lee Mack appears in every episode.