In the “Return of the King” Saraman escapes from Isengard and goes to the Shire where he takes it over and works to destroy it. In the Movie Saraman dies at Isengard. In “The Fellowship of the Ring” Tom saves the Hobbits from a barrow wright, in the movie the whole encounter never happens.
That said....I think Tom was a keynote..in the Hobbit. Loved that chapter...
But I am just me....a pawn in the game.