This is the second time Ricky sings "Cuban Cabbie."
Doris Singleton plays Lillian Appleby; however, during the closing credits, she's credited (vocally) as Caroline Appleby. Interestingly, in all her subsequent appearances, the character is named Caroline, although in one of the Hollywood episodes, Ricky refers to her as Lillian, while Lucy and Ethel call her Caroline, an obvious mistake.
When Ricky and Fred are discussing the election, Fred accidentally calls Ricky "Lucy" when he says bye to Ricky.