Fun fact: Douglas Adams, the creator of The Hitchhikers Guide to the Galaxy, actually wrote most of the movie script. He died before the film was finished, but they kept it mostly the way he intended. So everyone complaining that it missed the point of the books or deviated wildly from the source material are arguing against the original creator's intent.

Another fun fact: One of Douglas Adams' running jokes with the Hitchhiker series is that it's never told exactly the same twice. There was a radio show, novel series, video game, comic book, movie... and every version is different. Sometimes the story is told slightly different, sometimes it comes to a completely different conclusion. So having a "loyal/faithful" version made is technically impossible, as there's no official canon story to recreate. Not should there be, as the ever-evolving retelling is part of the joke.

As a fan of the books in particular, I'd love to see an anthology TV series that is somewhat loyal to the book version. But I understand that Douglas Adams wouldn't want that, so I'm happy for the various media we have so far.