I don't even give a pass to Edlund. I will never, ever forgive him for having Sam confuse Metatron with Megatron.

Sam's only been researching angels and biblical lore since trying to stop the Apocalypse. This is the guy who recalls a random Native American symbol from a college class years ago. But he can't recall the name of a being who is mainstream knowledge enough to have made it into the movie 'Dogma' (god I love Alan Rickman in that!). Riiiiight.