Maurice Chevalier's facial expressions are so great; from him announcing her jealousy to the squinch he makes when the husband is attempting to zip up the wife's dress. He is a cad, but a lovable one. That drawer of guns was hilarious, making you realize that Chevalier's character is quite used to these types of confrontations.
The shot from the gun not having any effect caught me off guard but then I realized that, of course, the wife would have done it to garner sympathy from her husband, with whom she leaves even though they're still battling it out with words.
I, too, am interested in seeing the full film. I liked that, while the rooms are still opulent, they are not the bright and sterile white of a lot of the musicals done during that time. Is that part of the Lubitsch touch, too?