Originally Posted by DArtagnan
Don't even get me started on how they turned the fantastically tense and slow-building Shelob sequence into an action sequence with crappy music.

Yeah, that one wasn't great (though it didn't bother me too much), but the one that got me was in RotK (I think it was in that) where Gollum is arguing with himself. In the book, its a serious inner struggle between his two halves manifested in split personalities. In the movie theater, everyone was laughing.