Man, I watched those clips, and they were great. It's a shame that they were hardly ever shown in the american portions (though Carter did make a cameo in Martin Short's closing number). it seems, however, like they were playing roles. I wonder if Howard would really be rich if he appeared outside of those sketches. And with that it makes a bit of sense that he had a different role as choreographer in It's a Very Merry Muppet Christmas Movie.
The best one was the one where Carter hid the jar of apple butter. I also like the explosion one.
It would be great if they appear in the new movie (if it gets made) and any new series, but I'd stillr ather see the return of characters like Lips, Digit, Bill the Bubble Guy, Leon, Lindberg, Seymour, Nigel (both Nigel's), and Lubbock Lou and his jughuggers.