Great ep, definitely among the best of the Joel period. The "Creepy Girl" riff is absolutely classic.
Also a nice reference from ST:TOS- "I'm gonna eat all the fruit, and throw away the rind."
Yea, Brother!
Personally, I wanted to beat the lving daylgihts out of Tommy Kirk, but his post career booze/drug period took care of that.
Little Richard was so HIGH in that scene! He loves those goofballs!
I liked the 'Read all about it! Young white males declared best in world!' riffs. And yes, the 'Creepy Girl' stuff is really cute: 'I'd really like to hang with their crowd, but...oh well. Here, fishie fishie fishie!'
Really, I'm a little confused by the whole Tommy Kirk concept. I mean, I'm sure he's a nice guy and everything...but...he doesn't have any talent - not even the minimum required for teen-idol-hood. Was he a child star or something? (And if so, can we start using his movies as warning documentaries for Macaulay Culkin wannabes?) 
He was the kid in "Old Yeller". Apparently he had quite a career in front of him with Disney but managed to squelch that deal with the above mentioned addiction problem. You know you've got problems when Fred MacMurray tears into you. I think he even tried to make it on the Beach Blanket B movie circuit but couldn't even pull that off.
That whole "young white males" riff is such a great part of this ep. They really found a way to pound it home over and over without ever being repetitive, and to expose an underlying attitude of the times.
And, sadly, last I heard Macauly Culkin thinks he actually still HAS a career.
Wow. That's really sad (the Tommy Kirk story, that is. Don't even get me started on the Culkin kid). I haven't seen 'Old Yeller' in a long while, but I do remember that Tommy struck me as really appealing at the time.
Another thing I like about this ep is how all the 'Greek' people in the movie have such cut-rate accents. I mean, the Onassis-wannabe tycoon can't even muster a credible English lilt, for Pete's sake...and nobody seems to care a bit.
And finally - i agree with Joel: Little Richard got thru that embarrassing number by taking enough 'goofballs' to convince himself he was onstage at the Apollo!
Fun show, especially thanks to the terrible supporting cast (the chubby Charles Nelson Reilly loser, the ultra-effeminate master criminal, the bumbling insurance investigator). Do not operate heavy machinery while watching all three of these characters get down at the show's end! FUNKY!
Favorite Jokes:
"There's a new thing, it's called HARMONY!"
"BEEEN! BEEEEEEN!" (a la Clint Howard)
And the skits are good too, but the Tupperware sketch is absolutely horrid.
"It's Gloria Estefan and the Catalina Deux Ex Sound Machina!" is a personal favorite of mine as well. But they do use some recurring joke about ESPN over and over again.
If you ask me, the relentless bashing of The Cascades' performace was a tad unfair. I thought they were pretty good (though it might have something to do with the fact that there song was written by the great Ray Davies)
HOST SEGMENT REVIEWS
OPENING: Prayer Time. Just long enough. Not too funny, but some good zingers ("I don't know why they'd make a robot that can't walk down stairs.") B+
INVENTION EXCHANGE: Tank Tops, Tickle Bazooka. The tank tops are funny for about five seconds, and the tickle bazooka is lame. C-
JOEL REMEMBERS '60s: Good monologue ("People smoked openly on the Tonight Show!"), although I really wish Joel wouldn't blow his lines as much. A-
CREEPY GIRL SONG: Great stuff. "Crepy Girl!" A+
TUPPERWARE PARTY: Why is this in the movie? Pointless, pointless, pointless. D-
CHARTING THE FILM: Good idea, but could have been a lot better. And the payoff gag is just plain •••••• ("emotional Tootsie Roll center"). C+
Interesting Star Trek connection that doesn't seem to have been mentioned yet: Peter Duryea (Tad) played the navigator guy in The Cage/The Menagerie