Due to a last-minute script change, additional calendar geeks were needed at short notice, so writer Graham Linehan invited real-life software developers - Rik Heywood and Tim Browse - who'd previously worked together on Starship Titanic (1998) to play the parts. A copy of the game itself can be spotted on the shelves, and the 3D glasses on Moss's desk were used during the game's development.
The poster on Jen's door is a meme that says, 'I are serious cat. Please you step into my office now'.