This is Marion Lorne's final episode as Aunt Clara. She passed away on May 9, 1968 and posthumously won a Supporting Comedy Actress Emmy award for her role. Unlike with other characters on the show who received new actors when their originals left, no new actor replaced Lorne as Clara. In season six, Alice Ghostley was brought into play Esmeralda, a similar bumbling witch, but not a relative to Samantha.
This episode completed filming on February 19, 1968.