Apparently they were one of George Carl's sources of inspiration.
(Thanks to Ira Seidenstein for this anecdote.)
Wikipedia on Puleo:
Johnny Puleo (October 7, 1907 - May 3, 1983) was an American musician and actor, who specialized in playing the harmonica.As an actor he appeared perhaps most notably in the film Trapeze. But acting schmacting - the man was a fantastic slapstick Showman and a virtuouso on the harmonica.
I have included three clips, for those just browsing you'll see what you need in the first one or two, but for the arduous students of slapstick to see the permutations of the gags and the changes and additions to the act is very interesting.
Here is in all his angry Italian dwarf glory. Not pulling any punches. Funny as all that, from Hollywood Palace, 1965.
Hollywood Palace, 1966.
the Moulin Rouge in 1954.