SciFi and Fantasy Book Club discussion

I've never met a person who hasn't seen the 1939 film The Wizard of Oz. However, for those of us who read the book, this movie is very different. The movie's popularity means some things will never go back to what Baum wrote.

For example:
The ruby red slippers will never be the silver shoes.
Dorothy will be older with brown hair versus a Shirley Temple-like child.
The witch will be green with a broomstick instead of one-eyed with an umbrella.

What other novels have you seen made in other media and that film/TV has forever changed what you loved in the book? For good or for bad.

The androids in Do Androids Dream of Electric Sheep? will never be unfeeling hostiles, but always the scared overgrown children of Blade Runner. (1982 film for me; I still haven't seen the new one.)

I'm sure Dune has some contribution to this discussion, but the film (again, the older one) and the book narratives are fused into one thing in my mind, so I can't pick out what it would be.

That's a good one. Someone also mentioned how the film ending for The Mist was so much more powerful than what Stephen King wrote.

The movie The Shawshank Redemption was sublime! despite the fact that Andy Dufresne was small, short and unassuming in the novel, but played by Timothy Robbins in the film, and Red was a red haired Irishman in the book, but played by Morgan Freeman in the film. They were both so perfect, despite looking nothing like their literary counterparts.

I didn't like how the people in the Maze Runners were suffering from crazy severe dementia but in the movies they popularized them by making them zombies.

Oh, I also didn't like how they changed the entire story line of
Ready Player One to make a movie that only shared the title and character names.

Two perfect examples for this thread are Gump and Co. and The Lost World. In both cases, the authors wrote sequels not to their own books, but to the movies based on their books. Even the authors agreed the collective memory from the films had taken over what was written in the initial books.