At one point, Sam zaps a backyard swimming pool for a quick dip on a hot day, then zaps it away. Gladys sees all this from across the street, but Sam and Darrin's backyard was off the rear of their house and could not be seen from the street.
In Darrin's dream about what life would be like with a bunch of little witches and warlocks running around the house, one of his and Sam's children is named Rebecca. Ironically, when Elizabeth Montgomery became pregnant during the 1969-1970 season, the one where Adam was born, she gave birth to a daughter that she named Rebecca.