When Jip first picks up Koop in his car you here the radio broadcast of BBC's Radio One. The MC is Pete Tong, who is the movie's Music Supervisor. Pete Tong actually does have a weekly radio show on Radio One.
There is another cut of film called Human Traffic Remixed. According to The Guardian there were rumors that Justin Kerrigan wasn't involved with edited version but the producer Allan Niblo was. There are also rumors that they had fallen out during the shoot. It is available on DVD in the UK
The 'Making of' feature on the Remixed DVD goes into the difficulties of filming a 4 minute Steadicam tracking shot. This shot never appeared in the final version of the film and led to the first Assistant Director leaving the project.