An older post, called The Sound Of Robert Heinlein’s Voice, has finally turned up some of that very stuff!
Check out this wonderful video a 1949 group interview from the set of Destination Moon! Robert A. Heinlein is there, on set, as he served as a technical adviser.
Heinlein appears at about 5 minutes into Part 1. He reappears again, briefly, at the end of Part 3.
[immeasurable thanks to Robert, Bill Higgins and CrowTRobot1313]
Posted by Jesse Willis