First appearance of the recurring character Aunt Clara.
The first Halloween episode, and the first show to explore stereotypes and prejudices.
First of two appearances of Reta Shaw as "Bertha"; later in the series she appeared as "Aunt Hagatha".
One of the very few times a witch's name doesn't end in the letter "a" with the character "Mary."
The candy Darrin is eating at the beginning of the show is "Chuckles," a sugar-coated jelly candy, similar in consistency to gumdrops. The name can be seen briefly as Mr. Brinkman holds the bag.