BRANDON: Commander, as I was saying... In "The Quasar Dilemma", you used the auxiliary of Deck B for Gamma override. But online blueprints indicate Deck B is independent of the guidance matrix, so we were wondering where the error lies?
JASON: It's a television show. Okay? That's all. It's just a bunch of fake sets, and wooden props, do you understand?
BRANDON: Yes but, we were wondering-
JASON: There IS no quantum flux and there Is no auxiliary... THERE'S NO GODDAMN SHIP, YOU GOT IT!?
I highly recommend the movie for anyone who hasn't seen it.
Homer: [to Doug] Let me ask you a question. Why would a man whose shirt says "Genius at Work" spend all of his time watching a children's cartoon show?
[pause]
Doug: I withdraw my question. [takes a bite from a bar of chocolate]
The answers to certain questions have value in furthering the story you want to tell. Other kinds of questions do not. Focus on the former, ignore the latter.
Obvious, I suppose. But I also imagine it's vital to keep this in mind as you write a piece of fiction, in order to keep yourself on track.
His answer on why 42 is as disappointing.
That's not really fair - there are plenty of very good motivations for writing (and reading) fiction other than immersion in a sustained imaginative world. By that criterion, "Avatar" is a better film than than, say, "Casablanca," because James Cameron knows more about the flora of Pandora than Michael Curtiz does about Morocco.
Adams is a great writer precisely because of his lack of pretension, his humility, and his irreverence -- I'd be disappointed if he didn't regard his own work with the same outlook he had for everything else.
Some writers would consider their characters to have some kind of additional existence inside their (the writer's) own mind. They would "know" things about their characters which they never put into print; not to the level of what sort of computer they used, but certainly a more fully-functional mental model of the character beyond the words on the page.
Douglas Adams wasn't one of these writers, he was a writer for whom the characters were always to a certain extent subservient to the joke and the narrative. And Arthur Dent is a particularly strong example of this since there was never all that much to Arthur's character; he's essentially just an unidealised version of Douglas Adams himself who travels around the universe reacting to things in pretty much the same way that Douglas Adams would if Douglas Adams found himself with no home planet and no tea.
Actually I think it's quite brilliant. With all the religions, myths, legends, verbal stories, calendars, moon phases, planet alignments, mathematical projections, physics... these things of complication, what if the understanding the universe is just as simple as 42!?