Marv(Metatron) wants Castiel to go to a place that has the "greatest caramel apple crepes" and talk while eating. Yet a couple seasons later, Marv becomes human and supposedly eats for the first time, going on and on about how good food is.
Crowley uses the Supernatural book series to find people Sam and Dean have saved, first Tommy from season 1, then Jenny from season 7. However, Chuck Shirley, the author of the Supernatural book series, 'vanishes' at the end of season 5, meaning Crowley can't have found out about Jenny from the books.