In the tap-dancing segment of "The Old Gumbie Cat", you see all the cockroaches and Jenny having a good, old-fashioned tap session. However, precisely one frame later, you will notice that Munkustrap, Bombelerina, Demeter, and Jellylorum all apear in the front of each cockroach line, starting the sort of "running man" tapping. This happens just before Jellylorum trips.