- Brother of Woody Harrelson and Jordan Harrelson.
- Harrelson's father, who was a contract killer, was arrested for the killing of Federal Judge John H. Wood, Jr. by rifle fire in 1979 in San Antonio.
- His father was convicted and eventually died during his life sentence in United States Penitentiary Administrative Maximum Facility.
- At 22 he followed his brother Woody to California. "I came to L.A. to starify," he says. But finding nothing like Woody's success, he gave up acting for a while to become a motorcycle racer, rising to No. 8 in the 1992 pro national rankings. "After seeing a few people killed," says Brett, he became Woody's assistant and began to pursue his acting career again.
- After spending two years in Germany he returned to Lebanon, Ohio and worked as a legal clerk.
- Harrelson attended Lebanon High School but dropped out at 17 to join the Army, spending two years in Germany.
- Son of Charles Harrelson and Dianne Harrelson.
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