The scenes are cut, obviously, because of time constraints. Movies have to be shorter. There are some excellent adaptations in my opinion (Interview with the vampire 1994, the Name of the rose, are two of my favourites) but they are difficult to find. Generally, we are never happy with the adaptations. It's because you are seeing someone's IDEA, someone's IMAGINATION of how the action happened, and the one you wanted and loved is your own.