- Is a father of two.
- Younger brother of Austin O'Brien.
- Ben Stiller personally chose Trever for the role of Derek in Dodgeball: A True Underdog Story.
- Trever attended Newport Harbor High School in Newport Beach, California for three years before transferring to the Orange County High School of the Arts and graduating in 2002.
- Was in the running for the role of Mark Sway in Joel Schumacher's The Client. The role went to Brad Renfro.
- Trever had over ten pets growing up. He even brought back two dogs from Romania in 1995 when he filmed there. He now has a French Bulldog (as of 4/24/2009) named Futher Mucker (or Mucker for short).
- Studied at Azusa Pacific University, in Azusa, California. (December 2004)
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