It is practically certain now that the young cigarette manipulator is the credited Marion Stephanie (an eighteen-year-old magician) and not at all the uncredited Suzy Wandas, almost 40 at the time.
Cliff Edwards also sings "Hang On to Me" in Marianne (1929), 6 years earlier. His accompanist, Suzy Wandas, per Magicpedia was billed as "The Lady with the Fairy Fingers".
The section where the Three Radio Rogues sing their number they briefly turn into Ted "Is Everybody Happy" Lewis, Jimmy Durante, and Bing Crosby.