Ok I'm now almost sure this does not occur in the Hobbit, otherwise someone would have got it. I'll give another clue and if someone feels it's been too long they can post a new one and I will give the answer.
Hint #2: The title has a name of a place and a type of living thing
-~-~-~-~-~-~-~-~-~-~- In utter chaos lies impeccable symmetry.
And I've spotted the error, too! Yeah, I know. That's not right. But is 'Bag End' in the answer?
[ 10-23-2001: Message edited by: Musnud ]
-~-~-~-~-~-~-~-~-~-~- "The fox is a beautiful example of the way each of us, at times, casually cross paths with people who are at the beginning of an epic and critical chapter of their lives, and we notice them as we pass, and then think no more about it... And yet those people are about to live through something enormous."
Actually, now that I think of it, this is actually something from LotR, not the Hobbit. However, it is mentioned in the Hobbit (although in a "slightly" different manner), so I suppose it's still relevant.
That being said, I suppose that's your first hint.