The song "Golden Brown" by The Stranglers is played toward the end of the episode; however, this song was not released in England until January 1982.
After 4 minutes during the chase with the Motor Bike, the top of a DLR train can be clearly seen . The DLR was not opened until August 1987.
The calendar in Alex's flat shows that the episode was set on and around 22 September 81. The final featured music track, which also plays over the credits, is "Ghosts" by Japan. The track was from the album Tin Drum, which was not released until 28 November 1981. "Ghosts" was released as a single the following year.