Last show of the series.
It is somewhat ironic that the series' final episode dealt with aging in the workplace, considering Lucille Ball had spent 23 years aging on series television. Her characters never disclosed their true age which became a running gag.
Ironically, the evening this final episode first aired on CBS, Lucille Ball was up against her old pal Bob Hope on NBC in "Call Me Bwana," the 1963 film being shown on TV that night.
Ten years earlier, Gale Gordon also ended season two of "The Lucy Show" with a pie in the face in "Lucy Enters A Baking Contest."