During the impressive film career of Ginger Rogers - her Hollywood era totaling 73 feature appearances between 1930 and 1965 - only five of her movies failed to be rewarded with contemporary New York Times reviews: this picture, Rafter Romance, the British-made Beautiful Stranger, The First Traveling Saleslady and The Confession.
When the prison sergeant says "Take a look at the 400 and see that they're all there", the reference is the 'Four Hundred', a term used to describe the social elite of New York, especially in the last half of the 19th Century.
When Uncle John refers to "Nine Yokohama" he is talking about a famous Japanesebrothel.