- During the shooting of The Cutting Edge (1992), Moira spent over two months in figure skating training with her co-star D.B. Sweeney. They became close friends and remain so this day.
- She was cast by director James Gray in Little Odessa (1994) because he was impressed by her performance in Twin Peaks: Fire Walk with Me (1992).
- She was originally cast as Geena Davis' younger sister in A League of Their Own (1992), but hurt her ankle on the set of The Cutting Edge (1992). The role instead was given to Lori Petty.
- Attended and graduated from Marymount Manhattan College in New York City.
- Irish-American.
- Her husband Steve Hewitt is a Texas businessman and she has two children by him. Her daughter is named Ella and was born in 2002, her son is named Eamon and was born in 2003. They currently reside in Flower Mound, Texas.
- Attended and graduated from Connetquot High School in Bohemia, New York (1986).
- Of the actors that only appeared in the series twice, she has one of the longest gaps for reappearing on Law & Order (1990). She first appeared in 1991 in Season 2 in Asylum (1991), and then again 17 years later in 2008 in Season 18 in Betrayal (2008). She played a different character each time.
- When cast in David Lynch's Twin Peaks: Fire Walk with Me (1992), she went home and received permission from her priest to do her first sexual scene.
- She was initially contracted to play Polly Pry, the female lead in Trey Parker's Cannibal! The Musical (1993), but pulled out because she feared this would damage her serious movie career.
- Listed as one of twelve "Promising New Actors of 1992" in John Willis' Screen World, Vol. 44.
- She narrated the audio book for "Jacob Have I Loved" by Katherine Paterson.
- She is the mother of Ella Hewitt and Eamon Hewitt.
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