Elizabeth Montgomery was pregnant during production of the pilot, requiring some scenes to be carefully filmed in order to conceal her condition.
Rehearsals for the pilot were supposed to begin November 22, 1963. However, the rehearsal was postponed because of the assassination of President John F. Kennedy.
When this episode originally aired it was in black and white monochrome. By the mid-2010's the episode had been colorized.
Actor Dick York breaks the fourth wall during the episode, directly addressing the audience midway through the episode.
In the original draft of the pilot, Samantha was named Cassandra.