I found the George double-reveal to be the only exciting part of the episode. It felt like a really serious practical joke that fully embraced and exemplified how dumb the show is.
Season 6 finale: The Seattle Grace staff reminisces about George. Izzy pulls out a picture of the funeral.
Lexie: Wait a second... that casket has marble handles. George's casket had bronze handles. IT'S THE WRONG CASKET!
Stunned silence.
Lexie: WE NEVER BURIED GEORGE!
Cut to rotting, jawless, fly-covered corpse in supply closet, then to commercial.
Lexie: Oh, nevermind, we did bury George. I got the caskets mixed up in my head.