Little Jerry, pre-Monotones
This will knock your socks off. Way back in the first season, there was a protoype of the Monotones. Bob is seen with a bunch of hippie Muppets, and he's actually putting Jerry's orange hair on top of his pointy green head. Bob walks off, the lights dim, and they lauch into "Spinning Wheel", which at the time was a big hit for Blood Sweat and Tears. There is a spinning wheel and a light show flashing on the screen behind them. It looks like Sesame Street at the Fillmore East, very groovy, very psychedelic. Little Jerry was actually performed by Jim this time.
I'm afraid this one will never see the light of day on an official release, due to all the legal clearances involved. (Just like I'm not holding my breath on the Muppet version of "Up, Up and Away").
But the fact is this clip DOES exist, and a copy is out there SOMEWHERE.
I would also love to see them release a Little Jerry documentary, kinda like Spinal Tap. It could be great.