An example for The Hunger Games films, they missed out vital parts, like where Katniss got the Mockingjay pin from (Madge wasn't even in the films >:c)
Harry Potter: Winky isn't in any films and neither is Peeves the Poltergiest. Harry's eyes are different to his mothers', although he's supposed to have her eyes.
Too tired to list more

(Btw I won the debate because my friend gave up when I wrote a four-paragraph essay on why he should read more and why I think books are better
