Cameos: Clyde, Sarah Jane, and…probably someone else from the Whoniverse.

Inside Mr. Fell’s Used Books:

Aziraphale: Take some tea and pass it down.

Clyde: Right.

Crowley: Angel, we can’t cram any more people in here.

Aziraphale: B-but…

…I don’t want to get rid of the books…

Crowley: Why are you looking to me to be your moral compass?