One of the extras in the London street scenes is wearing an Ace Rimmer t-shirt.
They Walk Among Us! is a real comic book shop in Richmond, London.
Craig Charles suggested that any reference to 2009 be removed from the script to avoid the series from becoming dated. The time frame is instead referred to as "the early 21st century".
The shots of the Carbug driving on the road were filmed at Qinetiq headquarters in Farnborough, Hampshire. Because of all the modifications made to it, the Carbug was not street-legal and could not be driven in London.
The Carbug is a customized Smart Fortwo. Smarts only have two seats so in the long shots of the Carbug driving down the road, only Craig Charles and Danny John-Jules are actually in the car. For close-ups the seats were removed and the four Dwarfers are sitting on boxes.