For some reason, the noise of Pippin knocking the chain/bucket/skeleton down the well in Moria sounded much louder than I remember it at the movies.
I heard the voice of the ring a lot better too.
I do know what you mean about picking up new things on the small screen... In the theater, sitting too close as I always do, I was always forced to focus on just one face, just one part of the screen... On the small screen you actually can see the "big picture".