Piggybacking off the early premiere thing, how late were certain shows on in your area past their cancellation, whether reruns or bicycling?
As far as I know, WLNY was airing The $25,000 Pyramid well into the 1980s (1985 at least, IIRC), WPIX aired To Tell The Truth until at least 1980 as part of their nighttime game block that included Tic Tac Dough and two others (You Don't Say with Jim Peck being one).
Keep in mind I'm talking shows strictly made for syndication and not specifically sold rerun packages. So don't list the limited PYL rerun package or the Card Sharks package.