You get so used to Disney you forget just how different a movie like this can be.
My favorite part was, of course, the first 5 minutes where you are still in 1935. I immediately recognized the band leader, though I can't remember his name at the moment. The guitar player was a perfect caricature of Django Reinhardt, though I doubt he ever played a guitar with his feet just so he could smoke at the same time. The Josephine Baker caracature was dead on as well.
And if you want to see Fred Astaire eaten by his own shoes, this movie is for you.
That thing at the end looked like it was out of "The wall", so I'm not sure what was going on with that.
And they never quite explain where they got a lifetime supply of WW2 German grenades, either.