On the phone, Dick and Anne tease Duckie that they can't agree on which vacuum cleaner to buy, a Peerless or a General Electric. The joke here appears to be that Peerless was an old maker of hand-pump vacuums, never electric ones.
According to Variety, Warner Bros paid Columbia Pictures $7000/week for the use of Barbara Stanwyck. That's equivalent to about $141,000/week in 2023.
The play that's referred to, "Fifty Million Frenchmen," was a musical comedy written by Cole Porter and opened on Broadway in 1929.
After Georgie gets several bottles of liquor from Dick, he also asks for some ginger ale and White Rock. In the early 20th century, White Rock was the premium sparkling water (carbonated water) brand of the era.
Georgie says Margie "seems a little in her cups." This is an old-fashioned phrase that means she's drunk. The term appears to have been first used in the 1611 version of the King James Bible, in 1 Esdras 3:22, one of the books of the Apocrypha. The 15 books of the Apocrypha were removed from the King James Bible in A.D. 1885.