Again like Laurel and Hardy, this comic group uses sound to their comedic advantage. The Marx Brothers definitely exist in the lineage of Buster Keaton and Charlie Chaplin in terms of the use of repeated gags to create a laugh, and often the third attempt of the gag being the one that gets the biggest laugh. However they also incorporate the fast talking comic element of the 1930's into the pre-existing Trampesque character based gags of the 1920's to form a troupe in a sense.
The mirror gag is by far the best of the film and is absolutely in the style of Chaplin.
Again you have a poor man’s protagonist playing on the airs of the wealthy to create gags for poor audience goers, this is very much in keeping with Chaplin, but the Marx Brothers brought it into the sound era, emphasizing their ideas with the fast talking jokes and quips. You’re seeing fast talking american comedic dialogue emerge. And the Marx brothers are masters of fast quips and word play. Most of the jokes in this film are twisting words around to have different meanings.
These factors will converge to create the soon booming Rom-Com genre. It's interesting that this film didn’t get a warm reception for trying to tackle politics and political issues, people thought that it was silly and disregarded it during the times. However, what's ironic is the war like satire that the Marx Brothers make in this film will soon become a reality for most.