Here's proof (as if any were needed) that they just don't make television like they used to: An excerpt from the 1976 Paul Lynde Halloween special. Yes, for whatever reason, some executive at ABC thought this would be a good way to celebrate the holiday.
Yes, that is indeed Margaret Hamilton playing Paul's housekeeper, who then goes on to reprise her role as the Wicked Witch of the West. (Let's hope the make-up is a lot less toxic than it was than that of nearly forty years earlier!) She clearly is having a ball. This alone would be enough to recommend the special to anyone, but it also features one of the earliest television appearances by KISS (and Gene Simmons utters the immortal line, "We're not wearing make-up"). Also, Billy Barty, who played the lead villain in Under the Rainbow, is also in it (as seen in this clip). If you want to see the whole thing, it's available on DVD and streaming video.