On the cliff in ACT 4, it does get ahead of itself at parts and then goes back - really confusing. When you write a strategy guide, you should always write strictly sequential.
In the Hades Room with the rolling balls, it never mentions once that you have to go through the third door - so you never know where you are in the guide.
There are also erratas in this book: Notice how in the block puzzle it states to push the odd shaped block 90 degrees counterclockwise, when in fact, it has to be pushed 180 degrees. Also, one of the blocks is on the left, when it states that it's on the right. Now, I understand that I'm playing the PS3 version, and the developers might have changed some things (unlikely though). Even then the author could have gone a more clear route by taking a screenshot of the completed puzzle and highlighting the final shapes - instead of just a wall of text.
It also missed an item chest, containing a Phoenix Feather, underwater.
The roman numerals and the font are also unclear - I guess it's a tradeoff between maintaining the style of the game and being clear. Prima apparently went for the former.