Factual error: When the group comes to Mount Rushmore, they arrive at a lake. There is no lake close to Mount Rushmore (look at Google Maps, the lake used is Sylvan Lake, which is a good 15 miles away from Mount Rushmore). Mount Rushmore is suppose to be a "cover up" for the final treasure and that would make the chamber underneath the faces itself. (01:27:05)
Shamru
11th Jan 2012
National Treasure: Book of Secrets (2007)
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Suggested correction: The story-line states that Mt. Rushmore was created to hide the clues to the treasure, not hold the actual treasure.
But they climbed over Mt Rushmore to view the lake which is in a different direction.