It's like the Hannibal book. They changed the ending so dramatically when they brought it to film, I am not sure they could do another sequal, which was the original plan.
As far as Wicked, it should say that it is very loosly based on an idea and characters created in the book. Other than character names and the general "evil looks different from a different angle" idea, they are nothing alike.
OT: Something I don't get about the musical... Why on earth did they build a smoke breathing Time Dragon Clock if they weren't going to do more than have Glinda mention it as a time reference? I mean, it makes no sense if you never read the book. Was there more about it in there at some point? Anyone have any insight? Other than the standard "most of the musical makes no sense" answer. lol
Pretty pretty please don't you ever ever feel like you're less than
f**ckin' perfect!