Did you know that Walt and Ray Kroc (the guy who popularized the McDonald's restaurants) were in the same ambulance unit in World War I? There's a Disneyland tie-in there, and you can hear about it when Jim concludes the history of Splash Mountain.
Jim goes through the history of Animal Kingdom's Kali River Rapids ride. The combination of animals and raft rides dates back to Walt's days, and the evolution of whitewater-style rides in the 1980's brought the idea back to Disney.