I enjoy the series, but I do spot mistakes quite often in the books... Depending on how huge the mistake is, I just ignore it (such as in the third book, the characters were walking around the West side of Future World, but Ridley said it was the left. Later he gets it right saying the snake was heading towards the East of the park). But then there's the giant mistakes that just can't be ignored (
Chernabog is the dragon in Fantasmic? I doubt it!) so I just imagine the books are in an alternate universe where things in WDW are differnet to ours.
I still don't understand why none of the characters use the International Gateway in the book. Fridge logic I suppose...
If you want another book set in WDW, check out this one:
http://webyes.com.br/wp-content/uploads/ebooks/book_Down_and_Out_in_the_Magic_Kingdom.pdf
(Btw, it's been released under the terms of a Creative Commons License that allows the book to be redistributed anywhere without the permission of the author. There's a note about it at the beginning.)
I enjoyed a book series recently that had nothing to do with vampires, werewolves, romance, or sadness (well, it's a bit sad but it depends on the chapter). It's the Stoneheart series from Charlie Fletcher. It's now one of my favourite book series.
http://www.amazon.com/Stoneheart-Trilogy-Book-One/dp/1423101758