I was listening to a pre Thanksgiving show from 1939 and heard several references to the holiday that had the audience laughing at to what to me seemed to be inside jokes. Rochester talked about Thanksgiving and Jack responded with something to the effect that Rochester didn't even know when it was. Rochester replied that nobody knew, and the audience erupted in laughter.
Well, I googled Thanksgiving 1939 and what do you know, controversy!
The last Thursday in Nov. was the 30th. Retailers thought that put the holiday was too close to Christmas and would reduce shopping time. FDR then proclaimed it to be the 23rd that year and....well .... problems arose.
Check out: http://docs.fdrlibrary.marist.edu/thanksg.html
You never know what you learn listening to Jack Benny!