Betty Lynn The Academy of Television Arts & Sciences Foundation Presents 02:26 Tabs Who talks about this person Elinor DonahueView Interview Elinor Donahue on working with the cast of The Andy Griffith Show Don KnottsView Interview Don Knotts on Andy Griffith Show semi-regular Betty Lynn ("Thelma Lou") Doris SingletonView Interview Doris Singleton on working with Betty Lynn in The Boy Who Stole the Elephant, a TV movie