There's one movie in the middle of the last level, but chances are you've already seen most of it if you've downloaded certain movies online.
And of course the end game cinematics, which is the same no matter how you beat it (I enjoyed the cinematics, and acutally laughed during part of the end of it), and the different story book endings.
So far I've only gotten 3 different endings, and I've heard there's 4. Anyone know a link or any info that lists how to get them all?