- Maris was replaced in the cast of hard-luck "Viva Villa!" primarily because of star Wallace Beery's dissatisfaction with her.
- Although she was born 'Maria,' her family nicknamed her Mona, Spanish for "graceful" or "pretty," and she chose the last name of Maris because it reminded her of the sea.
- Fortunio Bonanova and Mona Maris were originally cast as Emporer Louis Napoleon and Empress Eugenie in "The Song of Bernadette," but the scenes were discarded, and were re-filmed with Jerome Cowan and Patricia Morison.
- 1909 Nobel Prize winner Gugliemo Marconi, the famous Italian radio engineer and radio pioneer, was a friend of her family.
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