rewatched this last night on cable tv, and just realised that their dance is quite similar to the dance Captain Von Trapp (Christopher Plummer) and Maria (Julie Andrews) do in The Sound Of Music!
ditto to most comments re loving this movie and knowing the words to the songs =))
-meeh-
Well, the dance that they do in sound of music is supposed to be based on an older dance, and I know that the director did a lot of research to make sure he did authentic dances, so maybe the one R&H based the dance for Sound of Music on?
shareyep forgot to mention that ie TSOM dance was said to be based on the Austrian dance Landler - http://en.wikipedia.org/wiki/L%C3%A4ndler
i was just amused to have discovered something new from the movie =)