Great episode. As I was listening I kept thinking of some things I had learned from a couple different backstage tours around WDW and wanted to share them.
This article while I can't say anything for it's accuracy goes into more detail in how they were able to route calls via attorney to keep secret. It's actually more on who established the plan to keep things secret and probably some information that will be upcoming in a future episodes. It's an interesting read.
Keys to the Kingdom tour goes into a little more detail in how the land was purchased. Specifically the point that kept coming to mind is disney was not connected to any of the corporations at all. Walt and Roy's friend Donn Tatum was entrusted to buy the land and later hand it over to disney. This is why he has the entire window to himself next to the window with the list of corporations that were formed.
I'm surprised Joe Potter hasn't entered the picture yet. My understanding from one of the backstage tours at WDW is he was very prominent in the choice of location and his ability (from experience with the Panama Canal) on how to divert the water and dry it up and where you can still see the channels dug roadside that even today move rain water away from the developed land. A picture of Joe with Walt and one of the last known photographs of walt on the florida property is proudly displayed and pointed out in the utilidors
One of the backstage tours made mention that the world's fair, in part, was a test to see if how the east coast residents would react to a theme park to test the waters before moving forward with any commitments. I would be interested in hearing more about this, I know the worlds fair had a lot of different angles disney was using but this one seems to be glanced over even though it's part of the behind the scenes tour information you learn.