" The film (at least, the John Wayne 1969 version) was very true to the book--Up until the last 25 pages or so. It is obvious that the screenplay was adapted straight from the book since many pivotal scenes and lines are nearly word-for-word and action-for-action. It was disappointing, though, to learn that the film so drastically changed the ending of the novel: LaBeauf doesn't die in the book; Mattie loses her arm to gangrene after the snake bite; Rooster Cogburn dies 25 years after the events of the novel take place, but Mattie never sees him again after he rides her to safety (so she never gets to thank him, and the touching graveside scene of the movie doesn't take place--And also one of my favorite John Wayne sayings was apparently written for the movie instead of taken from the book: "Well, come see a fat old man some time!"). The novel's title obviously refers to Mattie's character, although in the story she attributes the "true grit" she sought solely to Cogburn, even though she had it as well; by changing the end of the novel to a more Hollywood-ized ending for the film, I think a lot of the final "grit" that is apparent in the novel's Mattie character is missing from the film version's Mattie (even though the film version still had plenty of grit herself!). "
— Darla, 1/19/2014