- Apart from acting, he coaches the basketball team of a private all-girls Catholic high school in Los Angeles, California.
- Played shooting guard and small forward for the Wake Forest Demon Deacons from 1990-1994 and started alongside Tim Duncan. He had a career total of 387 points, 187 rebounds, and 114 assists in 89 games played.
- Marc's father is of half Polish and half Slovak descent. Marc's maternal grandfather was of English and Scottish ancestry, and Marc's maternal grandmother was the daughter of Serbian parents.
- Filmed one scene for House on Haunted Hill (1999), but it was cut from the theatrical release. The scene is featured on the DVD's deleted scenes section.
- Mark is a member of Sigma Phi Epsilon Fraternity Wake Forest University '94
- Named #6 of the Top Ten Sexiest Men of the Buffy the Vampire Slayer (1997)/Angel (1999) universe in a fan poll by the Buffy the Vampire Slayer fanzine (2004).
- Son-in-law of Dayle Haddon.
- Born on the same date as Amanda Peet.
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