Incredible Swing Dance Scene - from Hellzapoppin 1941

This could have gone under my other thread but this clip and the dancing with it is so interesting that I thought it deserved its own thread. A friend who is a cinematographer in California referred this clip to me. What is interesting is that they incorporate "spotters" (for safety to catch the dancer if there is an error) into the dance. At 1:19, for example, one of the dancers steps out with a move that places him under the woman dancer who is being slung around.

LINK