Common change is around all environments, from pretators, prey, food supply, and many more simple things. But change realy never happens unless its is forced. Natural selection
This is called the omniscent narration, in which the one who is being portrayed is the third person. The person usually tells the story in the background or the one who tells the story as the form of the author. They are usually the ones who tells the story or gives the thoughts of the characters or what is going to happen in the film.
They have producers and directors that keep them on track about what happens in the movie and how they make it.
