After visiting Bag End last night (again... even after a month in-game, it still thrills me for some reason), I have a couple of suggestions. There are a couple of things that I was looking for, but did not see. First, a large lamp with a red lamp shade in the dining room. Second, a map hanging in the hallway that is marked (in red) with Bilbo's favorite walking paths. And finally (although, this might be a bit too obscure since it would have happened 50+ years before the time period of the game), a fire poker and shovel knocked over near the fireplace. These things are all mentioned in chapter 1 of The Hobbit, so I can imagine new Tolkien readers (or those, like myself, who have been inspired by LotRO to re-read the books) heading up to The Hill to look for them.
This isn't in any way a knock against the fantastic attention to detail that already exists in the game. It's just a humble and respectful suggestion for even further improvement by a rabid fan. :-)