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Rehearsals for the pilot were supposed to begin November 22, 1963. However, the rehearsal was postponed because of the assassination of President Kennedy.
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Samantha was named Cassandra in the original draft of the pilot.
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Dick Sargent successfully auditioned as the original Darrin, but he was under contract at the time. He appeared as a regular on Broadside, the studio's spin-off of McHale's Navy.
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Originally in the script Endora was not named, but was called "Mother" when spoken to.
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Originally in the script, Darrin's last name was Douglas.
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The role of Samantha was originally offered to Tammy Grimes.
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The original version of the script was published by Sol Saks in his The Craft Of Comedy Writing, Cincinnati: Writer's Digest Books, 1985/Los Angeles: Lone Eagle Publishing Company, 1991.
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This episode was repeated on ABC on December 31, 1964.
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This episode was completed on December 9, 1963.