Wednesday, October 22 GOODBYE, CITY HALL (NET, 9-10 p.m.).* Outgoing Mayors Jerome Cavanagh, Detroit, Joseph Barr, Pittsburgh, Arthur Na-talin. Minneapolis, and Allen Thompson, Jackson, Miss., discuss municipal pressures, problems and palliatives at the executive residence in Detroit.
Thursday, October 23
NET PLAYHOUSE (NET, 8:30-10 p.m.). The Battle of Culloden is a documentary reconstruction done in newsreel fashion of the last battle to be fought on British soil and its aftermath. Repeat.
IT TAKES A THIEF (ABC, 10-11 p.m.). Senta Berger and Nigel Patrick are the guest stars in a comic caper, "Flowers from...