
While this might be a big omission, it is entirely forgivable since it would have only served to make an already long ending even longer.

Merry and Pippin in particular have basically become great warriors, and their military skill led the Hobbits to victory. The chapter demonstrates how Merry, Pippin, Sam, and Frodo have grown as characters and warriors since their journey. In the book there is an entire chapter about the four Hobbits' return to the Shire and what has happened in their absence. Unlike many of the other differences, the Scouring of the Shire is more of an omission than an alteration to the source material.

Out of all the differences between the book and the movie, the Scouring of the Shire might just be the largest, and oddly enough, it was one of my favorite chapters of the book because it was something entirely new and different.
