- His babysitter was Mary Travers of the folk-rock group Peter, Paul and Mary.
- Once played the mandolin in a high-school band with Arlo Guthrie.
- Made his film debut in an uncredited role in the 1971 comedy-drama The Hospital.
- Joined the cast of Saturday Night Live during the 1984-85 season as the Weekend Update anchor.
- Costarred in Rob Reiner's 1984 mockumentary This Is Spinal Tap, about a heavy-metal band; his character, Nigel Tufnel, was said to have been a parody of British rocker Jeff Beck. Later reteamed with Reiner in 1987's The Princess Bride, playing Count Rugen.
- Inherited family's royal designation after his father's death in 1996, making him the 5th Baron Haden-Guest of Saling, a district outside of London.
- Formed the instrumental group the Beyman Bros, along with friends David Nichtern and CJ Vanston, in 2009.
- 2003, Grammy — Best Song Written for a Motion Picture, Television or Other Visual Media: Winner
- 2001, Writers Guild Awards — Original Screenplay: Nominee
- 1998, Independent Spirit Awards — Best Screenplay: Nominee
- 2001, Independent Spirit Awards — Best Director: Nominee
- 1998, Independent Spirit Awards — Best Male Lead: Nominee
- 2004, Independent Spirit Awards — Best Screenplay: Nominee
- 2004, Critics' Choice Awards — Best Acting Ensemble: Nominee
- 1976, Emmy — Outstanding Writing for a Comedy-Variety or Music Special: Winner
- Peter Haden-Guest — Father
- Jean Hindes — Mother
- Anthony Haden-Guest — Half Brother
- Nicholas Guest — Brother
- Elissa Smith — Sister
- Annie Haden Guest — Daughter
- Jamie Lee Curtis — Wife
- Thomas Haden Guest — Son
- Attended Bard College, Annandale-on-Hudson, New York, United States; attended New York University, New York, New York, United States
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