Warren Keith and Bill both caught this one. Bill writes:
Here's one for you - I just started watching the show Nip/Tuck on dvd, and one of the episodes had a Joni reference. A lesbian character was talking about her experience with a man years before the conversation which was taking place. She said the man had long hair, and she just closed her eyes and pretended he was Joni Mitchell.
Since the show involves plastic surgeons, maybe they will use Happiness is the Best Facelift sometime.

(Contributed by Warren Keith and Bill)