IMHO all three lotr films changed stuff, but with FOTR everything was stuff I wanted to be changed when Ir ead the book and made the movie better. I hated the changes in TTT, PJ said it was the hardest to adapt but I find it puzzling because of the three it was the one that felt the most cinematic when i read it and my opinion was they could basically just stick to the letter on that one. ROTK was more like FOTR where the book it self needed some improvements, I thought the movie was great but some changes did bug me, mostly I could just tell what would be added into the EE.