What Really Happened?

I am going to start a thing on here, where I just make tie-ins and comparisons between the book and movie. So...if there are any movie scenes that you want me to break down with a comparison to the book, or try to find the inspirations and origins of the lines, let me know. A lot of the dialogue that you can look at and not have found at that spot in the book, is actually present elsewhere. The writers used as much of Tolkien's actual writing as they could, and the franken-lines are kind of fun to track down in the books.

For starters:

I: In the movie, at Helm's Deep, Theoden says something along the lines (pun intended) of: Saruman's arm will have grown long indeed if he thinks he can reach us here.

In the book:

Referring to Sauron, not Saruman:

"'His arm has grown long indeed,' said Gimli, 'if he can draw snow down from the North to trouble us here three hundred leagues away.'"

II: You know that part where Legolas talks about the Crebain from dunland? Well in the book, in the chapter The Ring Goes South, Sam and Aragorn on on the watch, and Aragorn (not Legolas) wakes Gandalf up to tell him about the crebain. 

III: In the movie, Gimli wants to go to Moria, and Gandalf REALLY doesn't. In the Book, Gandalf thought they should try Moria, and Aragorn didn't want to, so they attempted Caradhras, but were eventually driven down. So Aragorn agreed to go through Moria, as Gandalf had originally said they should, but says to Gandalf:

"And I say to you: if you pass the doors of Moria, beware!"

IV: In the movies, there is a surprise warg attack on the company fleeing from Edoras to Helm's Deep. While the book has no such attack in it, and it is quite the little twist, the fellowship is hunted by wargs in The Fellowship of the Ring, on their way from Caradhras to the Gate of Moria.