Plastic Bateman
Super Freak
Yeah you're right about that. It was the ending and a few more stuff IIRC. Though I'm not sure if I feel the original ending would have saved the game.
I always thought the one thing that shone in MGS4 was the underlying theme of pyrrhic victory. The original planned ending, with Snake and Otacon saving the world then being promptly executed for war crimes to the tune of Morricone's version of Here's To You, would really have given the game the final emotional gut-punch it needed.