https://www.youtube.com/watch?v=umhgO1O2Psc
A behind the scenes look at the first Garfield TV special. Features interview bits with Bill Melendez, Lee Mendelson, Lorenzo Music, and Desiree Goyette (Jim Davis appears as well). And guess which one of them modeled for the opening dance sequence.
I also didn't know that it was done at the Paramount lot.