Lord Error said:You have to look at it to see what to do with puzzles you encounter, and it unfortunately would pretty much spell out what to do. You couldn't flip through the pages however. It would open exactly at the puzzle hint/solution page.
Oh, I mean the page flipping thing. It sounded like you could but I guess you couldn't
In Uncharted 2, you can flip through like 10 pages at the first puzzle that requires the journal