The title refers to the term Abracadabra used by stage magicians which dates back to the Aramaic word meaning "I will create, as I say".
The idea that Samantha convinces someone they have special powers and then uses a seance to "scare the daylights" out of the person was used many seasons later with Darrin's mother in Samantha and the Antique Doll (1971).
Darrin pulled into the driveway with the top down on his car. A few minutes later when it begins to rain, Darrin runs to his covered porch without worrying about putting up the top on his car.