WORTH NOTING ON TV

THURSDAY This Old House (PBS, 8-8:30 p.m.): The popular series is back for a new season - its 11th - and with a new host - Stephen Thomas. (See preview at right.) SATURDAY World Series (ABC, 8 p.m., E.T., to conclusion): Game 1 of the great event will be aired live from the home park of the American League champions (undetermined at press time).

SUNDAY Earthbeat (Turner Broadcasting, 11 p.m.-midnight): Premi`ere of a weekly series about the search for solutions - on a global scale - to environmental and social problems. World Series: (ABC, 8 p.m., E.T., to conclusion): Game 2, live from the American League city.

TUESDAY World Series (ABC, 8 p.m., E.T., to conclusion): Game 3, live from the home of the National League champions (undetermined at press time). Schoolbreak Special (CBS, 4-5 p.m.): Cutting up frogs in biology class has become a high school rite of passage, but can you be a conscientious objector? ``Frog Girl: The Jenifer Graham Story'' tells about a girl who balked, and the significant legal events that followed.

WEDNESDAY World Series (ABC, 8 p.m., E.T., to conclusion): Game 4, live from the National League city. Van Cliburn piano competition (PBS, 9-10:30 p.m.): An inside look at the hugely prestigious event held every four years (See preview coming in this section Tuesday). Please check local listings for all programs, especially on PBS.