Lord of the Rings: The Return of the King – What’s the Difference? (Book vs. Movie)

From Cinefix:

The third and final installment of our saga about Peter Jackson’s saga based on JRR Tolkein’s saga is here! Without further adieu and no restraint on spoilers, What’s the Difference?!?!

Previously on GAS:

Lord of the Rings: The Fellowship of the Ring – What’s the Difference?
Lord of the Rings: The Two Towers – What’s the Difference?
[Cinefix]