I sometimes type a tail into google, and read it from 5 different sites, or so, so I can see how different they are. I find it somewhat intreaging just how different they are. Especially when it comes to the endings, or how some events in the story were said to have happened. I gives you a whole world to think about, even more original versions of multiple tales.
Yeah, that's a pretty large reference, and I'm sure credit was given. "The Journey to the West" I'ven't read too too much on, but enough to piece it together. I won't go into detail, so as to not ruin the story for you.