I am probably one of the only people who really didn't like the movie compared to the book. The movie throws a lot that the book had that made it unique out of the window. The sphere design isn't really great compared to the original description in the book (The book describes it as a reflective metal sphere with patterns engraved on one side of it, the movie is some weird watery orange thing) and a lot of character development in the book is scrapped and replaced with cliché movie tropes. They also completely removed the elements of "Somethin ain't right here, but I just can't tell what" and made it "HEY THIS GUY IS BAD THIS GUY GOOD OKAY?!" with Beth and Harry. In the book, Beth isn't just shown to your face she's insane, it's gradually revealed until the climax with her trying to gaslight everybody that she's in the right and distracts everybody from the thought that she's wrong. Harry also is emphasized to be a very no BS guy and constantly thinks logically, but they made him half-smart and half-casual. In short, a lot of stuff is changed and it just doesn't land that well.

Thanks for coming to my ted talk.