When Milburn Drysdale and Miss Hathaway go down to the Parthenon, they stop at the bottom of the stairs to talk to Sheldon Epps. When the cameras are momentarily switched to a long shot, Milburn and Jane can be seen dancing with the beatniks. When the cameras are switched back to a closeup, they're back talking to Sheldon by the stairs. Moments later they are seen dancing again.