How close is the film version of "Barn Burning" to the original written piece?

The movie adaptation of "Barn Burning" starring Tommy Lee
Jones is an excellent portrayal of the characters, events and themes of Faulkner's short
story.  The novel does an excellent job of showing the anger and frustration of the
father along with the coldness of his heart and his treatment of his family in contrast
to the fires he sets.  Sarty's shock and horror over his father's actions is
heartbreaking, and his fear and yet sadness as he runs away at the end is very
emotional.  The last image of the movie -- the wagon and his family -- driving away
without him is different from the story, but still an excellent ending to the
movie.