Nice notes. I also enjoy The Sound of Music OBC. I first heard it in 1971 or so when I was doing a production - it is most excellent.
A friend of mine who was an acting student at NYU in the 1990's had Liesel aka Lauri Peters as a professor. All of the students loved her and she was a great teacher, he said. Her first husband, Jon Voight was never mentioned, as far as I know.