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