Rob's got it right... they simply moved the well from the gaurd's chamber to the chamber that holds Balin's tomb.
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P.S. Did they keep Tolkien's line or not? I can't decide weither he's saying "You cannot pass!" or "You shall...
...And it is awesome. If the movie holds up, then it will be an outrage if this doesn't get a best picture oscar. On other news, Lordoftherings.net has switched back to Apple. They have the new trailer, but their site is swamped, so good luck trying to download it. I know I couldn't...