During the dual between Jelly Roll Morton and 1900, after Jelly-Roll finishes playing his 2nd piece, he stands up. While doing that, he kicks the piano chair with his foot moving it away from the piano.

Then, there is a 1 second scene showing audience clapping, and then, back to original scene where Jelly-roll is still standing but the chair magically moved back to it's original place in front of the piano.