Story [by James Kevin McGuinness] is a rather serious grand opera satire in which the comics conspire to get a pair of Italian singers a break over here. For their foils the Marxes have Walter King and Sig Ruman as heavies, Robert Emmett O’Connor as a pursuing flatfoot, and Margaret Dumont to absorb the regulation brand of Groucho insults.
Although King also doubles on the vocals, Kitty Carlisle and Allan Jones do most of the singing as the love interest.
Groucho and Chico in a contract-tearing bit, the Marxes with O’Connor in a bed-switching idea, and a chase finale in the opera house are other dynamite comedy sequences, along with a corking build-up by Groucho while riding to his room on a trunk. The backstage finish, with Harpo doing a Tarzan on the fly ropes, contains more action than the Marxes usually go in for, but it relieves the strictly verbal comedy and provides a sock exit.