Continuity mistake: At the end of National Treasure 1, Riley has a Ferrari 360 Spider. At the beginning of Book of Secrets, when his car is being towed away, it's a Ferrari F430 Spider. At the end of the movie, he is given back a 360 Spider.
National Treasure: Book of Secrets (2007)
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Directed by: Jon Turteltaub
Starring: Nicolas Cage, Ed Harris, Helen Mirren, Harvey Keitel, Jon Voight, Diane Kruger, Justin Bartha
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More mistakes in National Treasure: Book of Secrets
Riley: We've broken into Buckingham Palace, stolen a page from the President's super secret book, and actually kidnapped the president of the United States. What are we going to do next, shortsheet the Pope's bed?
Ben: Well, you never know.
Trivia: The easter egg roll scene was filmed on Mount Vernon, with the White House added in the background.
More questions & answers from National Treasure: Book of Secrets
Answer: It is never explained what was on the page. It was just a cliffhanger to set up for a 3rd movie, I think.