They borrowed the "C.A.S.H." joke from The Beverly Hillbillies
Hi -
I have just discovered "30 Rock" about 10 years after it started, and think it is great. And I loved Nathan Lane in this episode. Anyway, I will try not to "spoil" anything, but the "C.A.S.H." bit was also used in a Beverly Hillbillies episode years ago. I think it was the fall 1969 episode "Jed Buys Central Park" with Phil Silvers guest starring as a con man. I don't want to go into any detail any case anyone has not yet seen this "30 Rock" episode, but it was essentially the same joke.
Tom, El Segundo California