Highlights: The mirror scene, especially when Groucho makes a full spin and Harpo just pretends to finish it; Groucho picking a doughnut and dunking it in coffee while they cheer him with the anthem; the "help is on the way" montage; the line "he gets mad because he can't read"; Harpo's lively tattoos; the percussion act with the helmets, cited in "Hannah and her Sisters"; and more I would recall if I kept thinking
The last film the Brothers made for Paramount before decamping to MGM is a demented comedy masterpiece which satirizes and reduces the subject of international squabbling to an extraordinary level of absurdity. The team reach peaks of anarchic and surreal brilliance, particularly in the astonishing mirror sequence, and the script gives Groucho plenty of opportunities to deliver his trademark wise-cracking put-downs..
The Marx Bros. are very funny and, obviously, very sharp. It's damn difficult to write 70 minutes of one-liners and gags that good, I'm sure of it. But here's the thing: Comedy is generational, and it gets more sophisticated over time either through complication or simplicity. (And typically the former before the latter.) I can tell the Marx Bros. know comedy, but they don't make me laugh. They're foundational.