"The Bewitchin' Pool" is simply not worthy of being the series finale of what is likely the greatest television series of all time. There are so many great epsiodes of "The Twilight Zone" that would have made for a better finale. I agree with the subject matter that "too many parents divorce" and "too many parents ignore their children," but simply feel that this is one of the lesser episodes of the wonderful series.
I also could not get past the fact that Mary Badham's voice (which was largely dubbed) was annoying throughout the episode. It's almost sad to see Rod Serling and "The Twilight Zone" go out on this note.