Father Knows Best S06E31 - Not His Type

Betty's friend Diane is planning to marry George soon after college graduation. George is upset due to Diane's possessiveness and decides he wants to date Betty, and Diane agrees if he chooses Betty (saying she is not his type, the title of the episode). Trivia: This is the last episode of the series that is not a 'recut'. However CBS ran the series in prime time for three more years as it was so popular.