In the first episode Craven watches a TV interview in which Margaret Thatcher talks about nuclear weapons, but at the end of this episode an unnamed male is shown as being the Prime Minister.
"Edge of Darkness" misrepresents the Daisyworld model, showing black daisies growing at the end. Daisyworld is a scientific *model* in the Gaia Hypothesis, in a scientific paper by James Lovelock and Andrew Watson in 1983, which postulates a planet covered entirely with daisies (and nothing else), which change colour according to the amount of sunlight they receive. In "Edge of Darkness", the daisies turn black because of radioactivity.