One of my favourite parts of the Rumble was during Keith Lee's entrance, Brock looked at Paul, with an "Oh shit!" look on his face saying "Who's this motherfucker?!"
That one moment made Keith look like a bad ass, despite his short tenure. That fact that him merely walking to the ring had Brock concerned is great.
There were so many little moments like that from Brock (Dancing to MVP's music, his interaction with Shelton, running after Elias, laying dead forever after Drew took him out, etc), and others (all Rated RKO stuff) was what made this Rumble so damn good.