I hadn't heard about the glass, but there is this mention:
On 2002-11-20 16:35, Donnie B. wrote:
There's a story they tell about the first (unmanned) Saturn V launch. Walter Kronkite was covering the event for CBS. He was in an observation bunker several miles from the pad. The bunker had thick plate glass windows.
As the sound of the launch reached the bunker, the plate glass started vibrating so much that Kronkite was afraid it would shatter. He did the rest of his commentary standing, pressing on the glass with his hands to cushion its vibration so it wouldn't break.
"Five and a half kilometers away, in the studio trailer of the Columbia Broadcasting System, the commentary of CBS correspondent Walter Cronkite was all but
drowned out by the thunder of Saturn's engines, and Cronkite himself was subjected to a shower of debris shaken loose from the walls and ceiling of his broadcasting
- NASA history: stages to Saturn
Everything I need to know I learned through Googling.