- While shooting So Weird (1999) in Vancouver, Mackenzie was the legal guardian of co-star Patrick Levis until he turned 18.
- Sang in her father's music group, The Mamas and the Papas, when it made a comeback.
- Daughter of John Phillips of The Mamas and the Papas musical group and Suzy Phillips-January (aka Susan Adams).
- Skipped a grade in elementary school.
- Has been in rehab several times for drug and alcohol addiction.
- Her paternal grandmother was Cherokee Indian and met and married Phillips' grandfather in Oklahoma.
- Release of her book, "High on Arrival: A Memoir" by MacKenzie with Hilary Liftin. (September 2009)
- Sister-in-law of William Baldwin.
- Son, Shane Barakan (b. 1987), with Michael Barakan.
- Best remembered by the public for her starring role as daughter Julie Cooper in One Day at a Time (1975).
- One of her stepmothers was Michelle Phillips.
- She named her pug dog Franklin after her TV mom Bonnie Franklin.
- Childhood best friends of Lisa Coleman, musician in "Prince and the Revolution", and in "Wendy & Lisa" (with Wendy Melvoin).
- Playing Lily St. Regis in a national tour of "Annie," which stopped at Hollywood's Pantages Theater in October. (October 2005)
- Aunt of Jamison Leon Baldwin.
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