Along these lines, here's something else from a few short years ago that's mighty impressive:

http://www.youtube.com/watch?v=7sxFyu_U2go

Directed by a couple of guys from "The Simpsons," apparently. The Cabbin' around bit at the beginning goes on a trifle long, and after that everything is just right. The Fleischer riffs, general and specific, fly hard and fast, and the wall of faces near the end is (imo) a tribute to the non-repeating background they panned over in the "St. James Infirmary Blues" part of "Snow-White."