Kim Thomson and Erika Hoffman both appeared in Brush Strokes but they did not appear together. Kim Thomson played Lesley Bainbridge for the first couple of series and Erika Hoffman took over the role for the remainder of the run.
As Topol is giving a lecture in the hotel Glynis Barber is in the audience. She was in the episodes 2 prior to this but us not credited.
This is based on a short story by W. Somerset Maugham and was previously adapted in the feature anthology Trio (1950).
The second of two uncredited roles in this series by Ralph G. Morse who played one of the hotel guests, the other was in S9 E5, The Facts of Life (1988).