I accept that many changes had to be made for the sake of brevity, but I agree that the changes at the end seemed unnecessary. Why not have Frodo, wearing the ring, slip invisably away from the fellowship?
Also, the relationship between Frodo and Sam is not made clear in the movie. Was it political correctness that caused omitting the fact that Sam is Frodos servant? Sam is clearly devoted to Frodo, whom he calls "master" throughout the book. In fact, I felt that it was originally Sams sense of duty which led him to accompany Frodo and that his "dutiful" devotion evolves into "loving" devotion as the quest continues.
I loved the movie. I'm not going to fault it because it's not a book. I probably won't see it in the theater again but I'll buy it on DVD when it's available. I did come home and dig out my dog-eared paperback copies of the books.