belboid
Exasperated, not angry.
But it retained the main events of the novel, devised and presented by the novelist as an interrelated sequence.You are referring to the things from the book-plot. Even if a film tries to be faithful to a book, it can’t possibly get into 2 hours everything from the book, so the scriptwriters have to decide which elements they are including and what they are missing out. And that’s before the time they also lose by putting in extra things.
Which is literally what a plot is.