I think that a lot of the comedic effect in this season comes from them failing repeatedly at selling cocaine. It's a bit funnier than it would be if they were a resounding success. After all, skills that work well for spying (done under a legal umbrella) don't necessarily translate to the criminal underworld.

Actually an outstanding episode. It's too often when I watch this show that I wish the episodes could be more than 20 minutes long. Maybe some day the show will get a movie.