The very example I was going to relate.Mike Frezon said:Ron:
Closely watch Gene Nelson's (and Charlotte Greenwood and cast's) dance routine during Kansas City. Imagine how difficult it would be to recreate the same exact staging, blocking and footwork when filmed twice.
Well, they do a really great job of matching things up. But there's an instance when Nelson jumps up on top of a wooden crate. I'll let you discover and enjoy the rest. Viva la difference!
You'll also notice a frisky butterfly fluttering around Laurey and Curly during "The Surrey with the Fringe on Top" but at different moments of the song.