Thanks, Jim. I found the 'whiskers' one too.
I don't think this kind of comedy would sell nowadays.

To give someone the 'huckleberry' meant to give them bad treatment (from 1883 in print, see Lighter). Lighter roughly equates it with giving the 'raspberry'. Thus 'huckleberry doo' might mean Reuben got the raspberry, but it might also mean the 'bum's rush'.
I couldn't find it as a phrase, but huckleberry seems to have been common in slang phrases in the later 19th c.