Normally a spell can be nullified only by the person who initially cast the spell. In this episode it became possible for Samantha to undo Aunt Clara's spell and turn the chimp back to Darrin, because she learned the exact words of Clara's spell. After watching Aunt Clara only manage to turn Darrin from a chimp into a seal, Samantha is able to then turn Darrin directly into a human.
(Clara, who intended to exchange a hat, just turned Darrin into a chimpanzee)Samantha: (to chimp Darrin) What did she do to you?
Aunt Clara: (muddled, to Samantha) Well, the cap was too small and I made it the right size, but got it on the wrong head.
Gladys: Abner, I whipped up a bottle of my icebox cookies. Now I'm going over and give some to Mr. and Mrs. Stephens.
Abner: Why do you want to inflict suffering on such a nice couple?
This episode was filmed on May 20, 1965, Elizabeth Montgomery's fourth month of pregnancy. Throughout the first season, the producers shot around Elizabeth's pregnancy and hid it from view until it was disclosed in this episode.