Barrie Chase, who played the Theater Manager was the real Dick Shawn's dance/scene partner in It's A Mad Mad Mad Mad World (1963).
Although a drama, Leave 'em Laughing is set in the world of comedy and has several cast members known more as comedic actors including;
Peter Gardner, Jackie Flynn, Nikki Flynn, Mark Christopher Lawrence, Joe Nunez, Larry Brown, Chris Lusti and Mark Atkinson.
Based on an article in the LA Times about Carlo Coppo's (played by Peter Gardner) actual account of Dick Shawn's last performance at UCSD on April 17th 1987.