"The Infinite Improbability Drive is a wonderful new method of crossing interstellar distances in a few seconds, without all that tedious mucking about in hyperspace. As the Improbability Drive reaches infinite improbability, it passes through every conceivable point in every conceivable universe almost simultaneously. So you're never sure where you'll end up or even what species you'll be when you get there. It's therefore important to dress accordingly. The Drive was invented following research into finite improbability often used to break the ice at parties by making all the molecules in the hostess's undergarments leap one foot to the left in accordance with the theory of indeterminacy. Many physicists said they wouldn't stand for that sort of thing, partly because it debased science, but mostly because they didn't get invited to those sort of parties." Hitchhiker's Guide
Honestly that's the other thing in my mind. I know Adams was very clear he just wanted to change up the story but it was either him or some major comic writer who specifically said adaptations being the same story over and over are just boring.
That's a very silly take imo, I've watched some movies 20 or more times, and if I go watch a movie from a book I would like to see the story from that bloody book.
So you are saying I don't even know the real thing, now I'm really pissed off. My point is if uou want to tell a different story, give it a different name.
The one I saw get brought up a lot was the Arthur/Trillian romance. He had actually experimented with that in drafts for other versions, too, but the movie was the first time it got all the way to the final product.