- Has a graduate degree from NYU where he also teaches.
- Is a classically-trained singer.
- Helped to create The New Bozena for the stage with Rainn Wilson (The Office (2005)), who he has been close friends with for many years.
- His paternal grandparents were Italian. His mother is of three quarters Irish and one quarter German descent.
- Graduated Gonzaga College High School, Class of 1985.
- Born David Michael Costabile in Washington, D.C. He is the son of Mary and Salvatore Costabile.
- In America his surname is pronounced ko-stah-BILL (like in the man's name).
- In He's Back (2013), David Costabile is slapped twice by Sarah Rafferty.
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