I could have sworn that the fight with the wargs and Aragorn's brush with death happenned, but I was looking at that part of the book and counld't find it. I appeared also that the Lady Eowyn never left Edoras. Also, Eomer was at Helm's Deep and it was another Lord who brought reenforcements in the morning. The movie also left out the trees that moved in around Helm's Deep and took care of the orcs that retreated.
Oh well, I have only read through the book once, so I guess it is high time I read it again. I guess that was over 10 years ago.
I have an anniversary edition of the combined book published in 1991. It was illiustrated by Allan Lee. I understand he consulted for the movie. I think that is why the movie matches my imagination of the book so well.