There's a nice mirroring with these scenes that bookend what I think of as the pre-Arrangement era.
Aziraphale laughing together with Crowley, until he realizes this is unangelic and snaps out of it. Crowley turns away.
vs.
Crowley has been turned away, until Aziraphale realizes he's said something unangelic but this time it doesn't deter him. They end up smiling together.










