Continuity mistake: While Cissy and Jessica discuss inside the tennis club, a man with a blue shirt walks behind Jessica. From the opposite angle, he's metres behind, entering the place again, though he now exits through the left.
Continuity mistake: At Elliot's office, Carol discusses with Cissy, whose arms swap between crossed or not depending on the shot.
Answer: Because during Season 6, Lansbury wanted a lighter workload and to do other projects. So they had her just introduce and sum up the episode.
Rob245