What I did notice was the airbrushing on their faces to make Ian Holm, Elijah Wood, Hugo Weaving, Christopher Lee and Cate Blanchett look younger, not very subtle at times. Same thing for some of the dwarves. It's a blasphemy to mess with Cate's face in the first place!
I loved the movie, even if I didn't care much the dwarves and the slow start. When we get to Rivendell this is really the moment when it started to get interesting, at least for me. The HFR? meh... No it's not like a soap, but I can't say I like it either. The audio was fantastic, and it was soooo nice to hear the familiar themes of LOTR... I plan to see it again, probably in simple and archaic 2D this time.
Now, something that still bothers me: Warning: Spoiler! (Click to show)
Bilbo's sword is supposed to glow blue in the presence of orcs right? How come it was blue with a goblin, when Bilbo was about to meet and confront Gollum? Goblins are not orcs...