This is the first episode in which Agnes Moorehead does not appear. Although she receives credit for playing Endora in the opening titles of all 254 episodes, Moorehead made it clear early on that she had no wish to appear on a weekly basis. During the first season, she was contracted to play Endora in approx. 8 out of every 13 episodes.
Filming was completed on September 17, 1964, the same day the show premiered.
The title is a play on words. The saying is little pitchers have big ears.
Obligatory rear view mirror in Darrin's convertible when taking Sam and Mrs Burns to the ball game present then missing depending on scene and camera viewpoint.