Nancy Kovack (Sheila) would return to the series on the two-part Cousin Serena Strikes Again: Part 1 (1969), as a similar seductive character named 'Clio Vanita'.
A skin blemish on the center of Elizabeth Montgomery's right cheek is clearly visible in the first scene taking place in the nursery. The same sploch is either gone or covered with make up in later scenes. She is also filmed. and positioned on her left side for a few scenes.
One of the few times Samantha refers to Endora as "mom" when she say, hey mom!