Nigel Parsons: ....Ah, but at the end of "Eclipse" you do get the phrase: "there is no dark side of the moon, really. As a matter of fact it's all dark".
So they compound their error. "It's all dark"?
Surely, being roughly the same distance from the Sun as the Earth is, it should get the same (or more) sunlight per square meter as the Earth. (I say more because it doesn't have much atmosphere to reflect the sunlight).
Also, being smaller that the earth, the amount of reflected "Earthlight" it receives should be greater than the equivalent amount of Moonlight received by the Earth.
Of course, the 'side' of the Moon farthest from the Sun will appear dark as it is illuminated only by starlight (and occasionally Earthlight). But as the Moon also revolves (except relative to the Earth) the side facing the Sun changes.

Grandmother to suck eggs! My first degree (since people are bandying qualifications about on this thread) is in Astrophysics to I'm perfectly aware of all that. In fact, the full comment at the end of "Eclipse" was: "There is no dark side in the moon, really. As a matter of fact, it's all dark. The only thing that makes it look light is the sun." But you can't hear the final sentence! It was one of the answers solicited by the band from people hanging around the studio who were given various questions on flash cards to which they were asked to give spontaneous answers. This one was from the Abbey Road Studios doorman Jerry O'Driscoll and IMO in its full version shows a very reasonable level of knowledge from a "lay" person giving an off-the-cuff answer to an unexpected question.

Being VERY pedantic, the full comment would have been more accurate if it had been: "There is no dark side in the moon, really. As a matter of fact, it's all dark. The only thing that makes it look light is the sun, and a bit of reflected light from the earth, but since that originated as sunlight anyway, we can still accurately say that the only thing that makes it look light is the sun"

But this really is stretching the original point . As someone above put it "artistic license is allowed" in these situations.