first:
WARNING! PLOT SPOILERS! DO NOT READ IF YOU PLAN ON READING THE BOOK!
I was just about to start a topic like this, lol!
The Captain Cully scene is probably the biggest area of difference between the book and the animation. I can't think of any other place where the animation strays so much from the book. To be honest, I can't really tell which I like better. I thought what happened in the book was funny when Captain Cully and his men came roaring into the town breaking stuff, and when Schmendrick filled his hat with water and dumped it on his head. I kinda hope the new movie will take after the book here, because I'd like to see that!
There's also the whole thing about Hagsgate, and the curse and Prince Lir that wasn't in the movie.
Small differences as well, like how in the book Prince Lir says that if King Haggard knew Molly was friends with a cat, he'd kill it. But in the movie, the cat plays in King Haggard's throne room.
The character descriptions ARE really good in the book. Many of the lines in the movie are straight from the book.
~*PANIS ET CIRCENSE*~