Sean's oldest brother Eddie and nephew Ryan make up two-thirds of the Boston-based Celtic/Irish band The Boston Harbor Bhoys. For several years, Sean's sister Mary was a writer and producer in both Boston and Los Angeles.
Sean met both David Mamet and William H. Macy on the set of "Oleanna" in 1993 when the film was shooting in his hometown of Waltham, Mass. Mamet asked him if he had something to fall back on, to which he replied "Not really." Mamet then went on to say, "Good. Because I find that most actors who have something to fall back on usually do fall back."
The Salem, Massachusetts house from the 1993 film "Hocus Pocus" is Sean's aunt and uncle's house.
The name of Sean's production company, Witch Watch Films, is comprised of the nicknames of the towns in which his parents grew up. Salem, Mass, where his mother is from, is known as 'The Witch City' because of infamous Salem Witch Trials of the 1600s. Waltham, Mass, the town both he and his father are from, is known as 'The Watch City' because of The Waltham Watch Company, which made world-renowned watches for over 100 years from the early 1800s until the mid-1900s.
