- Her longest-running role was as "Hilda Hinkelmeyer" in 64 episodes (1962-65) of the NBC/CBS sitcom The Joey Bishop Show (1961). In the 1954-55 season, she appeared as "Emily Dodger" in 38 episodes of the CBS sitcom Willy (1954).
- On October 21, 2018, she was honored with a Sketch of the Day caricature on the website Star Portraits by a United States based artist known as Odoxesky.
- Upon her death, she was cremated and her ashes scattered at sea.
- Treen performed onstage in vaudeville and musicals before switching to film in the 1930s
- Was in three Oscar Best Picture nominees: Kitty Foyle (1940), It's a Wonderful Life (1946) and The Snake Pit (1948).
- She was a lifelong Republican.
- Mary Treen was a Republican who supported the campaign of Dwight Eisenhower during the 1952 presidential election.
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