- Developed a chronic alcohol problem in the early 1960s. In 1969, she attempted suicide by taking an overdose of barbiturates and slashing her wrists. She was later committed to California's Camarillo State Hospital for her alcoholism, but she regressed after her release.
- According to Hollywood lore, she was discovered by a talent agent while eating a shrimp cocktail in the seafood bar of the Farmer's Market in Los Angeles, California.
- Once named the Ideal Hollywood Secretary by the Hollywood Chamber of Commerce after she played a secretary in Miracle in the Rain (1956).
- Peggie used to return to her hometown of Appalachia, VA at least once a year to visit her favorite aunt to whom she was very close. A resident of Peggie's hometown of Appalachia, VA has recently written a two-act play based on her life. Much of the dialogue in the play is taken from actual letters Peggie wrote to her favorite aunt back home in Appalachia.
- While promoted by Universal, she was dubbed "Miss Classy Chassis", "Miss Cheesecake" and "Miss Jet Job".
- She was awarded a Star on the Hollywood Walk of Fame at 6266 Hollywood Boulevard in Hollywood, California on February 8, 1960.
- Her birthplace home is the largest house in Appalachia, Virginia.
- Parents' names were Doyle and Elizabeth Blair. Her father was a director of an industrial relations firm. When the family moved to Hollywood, he was hired as a studio manager at Goldwyn Studios.
- During her teens, she did some modeling and was also hired for a radio soap opera called "Today's Children".
- Her signing by Universal-International in 1950 was instigated by Universal star Audie Murphy, whom she was seeing at the time. She left Universal in 1954 and freelanced.
- Had one daughter with her third husband William McGarry: Erin Kathleen McGarry (born January 6, 1963 in Los Angeles, California).
- In 1949, she was voted "Miss Classy Chassis" by members of the United Automobile Workers Union from seven Western states.
- On August 11, 1973, her third husband, William McGarry found her body on the couch of her Hollywood apartment. Her death was later determined to be caused by cirrhosis.
- No relation to Mary Castle.
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