[Nerwen]

Rhun charioteer, I take it you mean aspects of the films that are often targets of criticism? Well, I'll second a couple of other people: losing Tom Bombadil and Glorfindel- not because I have anything against either of them but because it was a good idea to reduce the number of characters and subplots rather than trying to cram them all in.

There's a lot of little changes that mostly go unnoticed and undiscussed rather than criticised, but I guess that's not what you're talking about?