Things I'm excited for: the noise Crowley will make when someone just idly mentions 'The Library of Ash and Fire', where Aziraphale apparently just hangs out whenever.
LOL you know, that + Aziraphale talking about summoning the Bentley in another thread, I'm just picturing attempts at summoning cars...and accidentally summoning a living car. Like K.I.T.T or Lightning McQueen.