- Was remembered particularly for her long friendship with director Pier Paolo Pasolini, after his death, she dedicated herself to preserving his memory and life's work, including poetry and a well-received documentary about him.
- Started her career as a jazz singer before her acting debut in Federico Fellini's La Dolce Vita (1960).
- She had a great disdain for Dagmar Lassander. When Lassander was cast for a major role alongside her in Hatchet for the Honeymoon (1970), she made sure that her role was expanded while Lassander's part was shortened. Also, she treated Lassander very derogatorily. Decades later, Lassander claimed that Betti was "very rude", but didn't share any details out of deep respect for the older actress.
- Dubbed the voice of the Demon in the Italian version of The Exorcist (1973).
- Commander of the French Order of Arts and Letters. [1984].
- Notorious for her fierce temper and "diva" behavior on film sets.
- Even though she was born in the same Italian region as Henri Betti's ancestors (Emilia-Romagna) and sang in Rommel's Treasure (1955) where the melody of "C'est si bon" (composed by Henri Betti in 1947) is performed, she has no family connection with him because her real family name is Trombetti.
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