It is more about
feelings vs expressions, when it comes to compare movies and tv-shows with written media.
Imagine this scenario:
Alice and Emma meets. Alice told something to Emma, which makes Emma sad first, then makes her smile.
Now, imagine how can you write this down in a book? Expressions are hard to tell in written media so you can display his feelings by writing down his facial expressions. It is easier to tell her feelings and powered them with little expressions like then she smiles.
But in a movie, it is better to use facial expressions and body language. Emma suddenly sulks, then her lips begins to move slowly and ends up in a crooked smile. It is not good to use an outer voice to tell what she thinks while she can use expressions to express it.
The Hunger Games have a similar situation in here. First book is full of flashbacks which tells the story of Katniss and Peeta. Adapting this to a movie is not easy and logical. That causes to switch point of view which the story is told. Because books are all about Katniss and people or events around her. If you rip the parts that are hard to adept to the movie, what you had at hand is not enough to make a good movie.
Also, the book offers some action scenes, but not too much. But movie fans expects the movie to have more action scenes, because expressions are easier to use than feelings in a movie. That also causes explains some changed events:
- In the book, muttas have the faces of deceased competitors who died in the 74.th games, including Rue. That causes Katniss not to use her weapons since they are ones who died in the previous days or killed by her.
- In the movie, they are muttas with doggy faces, and Katniss uses her bow to hunt them as much as she can do. She do not have any feeling that stopped her from firing her bow