Haven't watched Arthur in quite awhile, but I did catch "In My Africa" once. Possibly the worst episode in the entire series? I can't really safely say that, as there are quite a few I still haven't seen.
One of my favorite 'classic' episodes is the second half of Buster's return to Elwood City ("The Ballad of Buster Baxter"). Art Garfunkel's random presence always makes me laugh! The fact that the kids acknowledge him maybe twice in the episode makes it all the funnier. In one scene at Muffy's house, Art is clearly sitting with the kids, yet they act as though he's part of the furniture. Now that I'm older, I sort of wonder what the heck Garfunkel was doing there. But hey, I never bothered to take that episode seriously, so why start now?
Incidentally, has anybody seen "Arthur's Missing Pal"? Any thoughts on it?