- Resided in Sweden between 1962 and 1965.
- Miss South Dakota 1970.
- Speaks Danish and Swedish fluently, and is of Norwegian and Danish descent.
- Endorsed L'eggs pantyhose in the late 1980s, and has never worked barelegged or worn open-toe shoes while host of Entertainment Tonight (1981).
- In the sitcom episode The Good Samaritan (1992), Michael Richards' character, Cosmo Kramer, suffers blackouts that are triggered whenever he hears Mary Hart's voice anchoring her show, Entertainment Tonight (1981). The New England Journal of Medicine reported that the sound of Mary's voice triggers seizures in an epileptic woman from New York.
- Resided in Denmark between 1958 and 1962.
- Her legs were insured by Lloyd's of London.
- Starred as co-host in Oklahoma with local radio personality Danny Williams on his daytime show sometime between 1970 and 1975.
- Competed in the 1970 Miss America pageant, and finished in the Top 10.
- Miss Sioux Falls 1969, she also won the swimsuit competition.
- Graduated from Augustana Academy in Sioux Falls, South Dakota (1968).
- Received her Bachelor's degree in English from Augustana College (1972).
- Friends with Alex Trebek and Tim Allen.
- Joined Entertainment Tonight (1981) on June 24, 1982.
- Starred in a pilot for a sitcom in the 1980s that failed to be picked up for a series.
- Has sported the "Farrah do" (Farrah Fawcett hairstyle) since the 1970s.
- Has two brothers, Michael Harum and David Harum.
- Godmother of the cruise ship "Marina".
- Her mother, Dorothy Harum, is a breast cancer survivor.
- Dixie Whatley looked just like her; they both worked in stars news magazines on television, and the two were often confused. Dixie was born two years after Mary.
- He was awarded a Star on the Hollywood Walk of Fame for Television at 7000 Hollywood Boulevard in Hollywood, California on May 12, 1989.
- Got her major break in television as a co-anchor of the popular nightly TV series "Entertainment Tonight.".
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