Alex Lifeson's(Rush) side project Victor(1996) contains a track called "Shut Up Shuttin' Up. This references a line from the cartoon.
Near the end of the film, Bugs' office has a sign that says "-Member- Detective Guild, Local 839". Local 839 of the IATSE was the Animation Guild, whose members made the cartoon.
Third appearance of Rocky, first appearance of his accomplice Mugsy.