well it possible happens from time to time, but normally thats not the case when its a movie with real-people and persons...

take lord of the rings for example or even Harry potter... they are pretty good, actually i don't know a single person who was not satisfied even the ones who read the books.. with anime and manga however, ... thats a different case.... most animes trie to be very close to the manga so there are "key pictures" (for example battlestance -> first attack move) very often and the character simply moves from one "key picture" to another... thats simply not worth it.