Groundbreaking sitcom "Father Knows Best" premiered 70 years ago, in October of 1954, and Emmy-nominated star Elinor Donahue shares show secrets. In addition to the real-life pregnancy that she had to hide when playing the teenage daughter, Donahue discusses why she left "The Andy Griffith Show," and her roles on "Get a Life," "The Odd Couple," and "Star Trek." Her memoir is "In the Kitchen with Elinor Donahue." This 1999 WHO radio interview is from Des Moines, Iowa.