In Episode 1, Daniel makes a call from a phone booth where someone has written "Reality Sucks" on the glass, and someone else has crossed out "Sucks" and written "or Nothing" below it. In the followup miniseries ("Cold Lazarus"), "Reality or Nothing" is the name of a group of anti-media terrorists.
Dennis Potter wrote a role for Louise Germaine, but she was unable to take it, as she was pregnant at the time.
Unusually, a rare collaboration between the BBC and Channel 4 in the UK for a piece of drama; BBC One showed the episodes first, while Channel 4 ran the repeat the following night.
The voice on Ben Baglin's answerphone is the same actor who plays the Media Mogul in Cold Lazarus.
In the Dennis Potter interview "Seeing the Blossom", Dennis Potter comments that he wrote "Karaoke" and its sequel "Cold Lazarus" based on the simple writer's premise: "If you wanted to make the world a better place, who would you kill?"
Ewan McGregor: The passer-by whom Daniel Feeld overhears quoting lines from his script is Ewan McGregor who had appeared in another Dennis Potter play, Lipstick on Your Collar (1993), 5 years earlier.
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