When Maddy is snooping around Hedley Shale's room, she opens a built in wardrobe that has been coloured to resemble the doors of the TARDIS from Doctor Who (1963). Hedley is played by former Doctor Colin Baker.
In this pilot episode the part of Adam Klaus is played by Anthony Head, but he was replaced by Stuart Milligan in all subsequent episodes in which the character appears.
Alistair McGowan, who plays Maddy's boyfriend Trevor in this episode, would later star in spoof skits of Jonathan Creek on the programme Big Impression (1999).