I remember as our 5th grade field trip came into the studio, he was cracking jokes with the crew, and even as a 10 year-old, I noticed how at-ease he was. He acknolwledged us all with a hello, then went to do his promo bit for the local station and appear on the local "Morning Show," which followed "Today" in Louisville. Even with the built up shoe on his (I believe) right foot, he had only a very slight limp.
Back then, even if travelling on personal business, network stars routinely stopped by affiliates for live or recorded promotional appearances. Now, it's all done via satellite. I don't know if Bill was between shows at the time, or if he was promoting his hosting of one...this was April '64. Anybody know?