There are two different forms of storytelling: Novels tend to come from the inside of a character, and movies tend to look at them from the outside in relation to others in their world.

You have plausible deniability, as they say in politics, as an author with movies. Because if the movie is terrible, you simply say they failed to catch the genius of the book.

You're able to do things in novels: introduce subplots, other characters, thematic layers and so on, in a way that you simply can't in a movie. A movie really has to choose its battles.

Walter Kirn Quotes