TODAY

Behind the Lines. NET's weekly probe of the American press. Tonight: How ethical are newspaper and TV reporters and editors? Should they accept free junkets from those they cover? Endorse commercial products? Take public stands on political issues? Interviews with Walter Cronkite, Harrison Salisbury, and Tom Wicker. Ch. 2, 8 p.m. 1 hour.

FRIDAY

CBS News Special. An examination of "upward mobility" among black families, filmed in Atlanta and Kansas City. Ch. 7, 9 p.m. 2 hours.

SATURDAY

Theater in America. "A Touch of the Poet," a Eugene O'Neill play about a 19th century Boston poet. Produced on Broadway in 1958, five years after O'Neill died. Ch. 2, 8 p.m. 2 1/2 hours.

The Coconuts (1929). The Marx Brothers' first, and worst, movie. A couple of good routines, though, especially the famous Groucho-Chico "Why a Duck?" scene. Ch. 4, 1:30 a.m. B/W, 1 1/2 hours.

SUNDAY

Bill Moyers' Journal. Eat your heart out, Ziegler. Ch. 2, 4 p.m. 1 hour.

MONDAY

QB VII (1974). ABC spent $2.5 million on this adaptation of Leon Uris's novel about a writer who accuses a successful doctor of participating in Nazi war crimes. With Leslie Caron, Ben Gazzara, and Joseph Wiseman. (This is part one. Part two is Tuesday at 8:30 p.m.) Ch. 5,9 p.m. Color, 3 hours.