Wendy (Brooke Shields) juggles work and single-parenthood on the last original episode of “Lipstick Jungle” (9 p.m., NBC, TV-14). Look for episodes of “Friday Night Lights” to air at this time beginning next week.

The cancellation of “Lipstick” points out once again the difficulties of launching and sustaining a drama or melodrama on network television. “Lipstick” would probably be a big hit on cable, where shows like “The Starter Wife” have thrived. “Lipstick” was based on the writings of Candace Bushnell, creator of “Sex and the City,” a show that was a hit on HBO and would probably never have succeeded on a network.

As “Lipstick” departs, Howie Mandel hosts the new series “Howie Do It” (8 p.m., NBC), a prank comedy show of the “Candid Camera” variety, the kind of show networks usually burn off during the summer.