1. The clip shows a much more optimistic view of life than what was actually taking place at the time. The lavish theater (no doubt, full of wealthy patrons), the large flower arrangement, the 5-pound tip, given without a second thought would not have been normal actions during the depression.
2. I believe musicals during the Depression Era were designed to entertain and make people forget about their problems. They could live vicariously through the wealthy characters.
3. If this movie were made pre-code, I'm sure the dress would have been more revealing.