“Grey Gardens” (8 p.m., HBO): Drew Barrymore and Jessica Lange play eccentric relatives

“Grey Gardens” (8 p.m., HBO): Drew Barrymore and Jessica Lange play eccentric relatives living in an old house and refusing to leave.

“Cast of ‘Saved By the Bell’: Where Are They Now?” (9 p.m., TV Guide Channel): One of the great mysteries of our time is finally solved.