Bugs Bunny sends up The Untouchables, which had wrapped its run by the time "The Unmentionables" landed in theatres in 1963.
Elegant Mess (Bugs) is sent to capture wanted gangsters Rocky & Mugsy. The usual chaos follows. This is a rare bird in that another actor other than Mel Blanc shares screen credit. That would be Ralph James, later the voice of Orson on Mork & Mindy, who does the Walter Winchell mimic as the narrator.