In France, the Twenties were called the "Années Folles". This fascinating decade began after the First World War and ended with the economic crisis of 1929.
During this period, the behavior of the French suddenly changed, with an aspiration to joy and debauchery, particularly in the upper and middle classes. The French tried by all means to get rid of the pre-war values.
The 1920s were a real watershed in the culture as well as in daily life which went through many changes. If you view this again, and again, and again, each time you'll notice details you hadn't noticed before. Enjoy!