LOTR in many aspects tweaked the books. The undead king for one wasnt portrayed in the book as such. And they killed Sauron's forces holding up Gondor's satellite states. They then led those men to GOndor's aid. But in the movie, the undead just fought at Gondor. Quite ridiculous. And Harry Potter books had big chunks taken away from the movie. T_T But I enjoyed both though.
