A lot of it is essentially silent comedy, like Keaton or Jacques Tati.
Per wikipedia:
“The original script was only 63 pages in length. Edwards later said it was the shortest script he ever shot from, and the majority of the content in the film was improvised on set.”
The gimmick at the beginning where he loses his shoe in the pool and the dinner scene where the waiter and butler are fighting in the backgroud in the kitchen are examples of silent comedy in it.