- His wife was the one who suggested the "dream season" to explain Bobby Ewing's return from the dead on Dallas (1978).
- Wears a medical alert bracelet on his right wrist to draw attention to his potentially fatal penicillin allergy.
- On November 18, 1986, teenagers Kenneth Miller and Sean Wentz murdered Duffy's parents, Terrence and Marie Duffy, during a robbery at the couple's Boulder Bar in Montana. Wentz and Miller each named the other as the one who fired the shots that killed the Duffys, but both men were convicted of double murder and were each sentenced to 180 years in prison. Later Wentz recanted his testimony and told prosecutors he was the one who murdered the couple, but Miller's November 2000 appeal of clemency was denied.
- Son Conor Duffy (b. 1/16/80) played "Little J.R." on the final episode of Dallas (1978) in 1991.
- Could hold his breath underwater for three minutes during his Man from Atlantis (1977) days.
- Son Padraic Duffy graduated from Princeton (NJ) University in 1996.
- In a relationship with Linda Purl (November 2020].
- Stated that he was unhappy with the final episode of Dallas (1978) because it broke away from the format that defined the show.
- Named one of the 100 Alumni of the Century by the University of Washington.
- Beat out Steve Kanaly for the role of Bobby Ewing in Dallas (1978). Kanaly would play Ray Krebbs.
- Dallas (1978) producer Leonard Katzman hired a non-Dallas (1978) crew to film what the crew believed to be an Irish Spring commercial with Duffy. The crew spent hours filming the commercial, which was then superimposed into a scene from Dallas (1978). The result is the famous shower scene where Duffy's character, "Bobby Ewing", returns from the dead and says "Good Morning" to his TV wife, played by Victoria Principal. Principal did not know that Duffy was returning to the show until she saw that cliffhanger on TV, and then phoned him.
- In July 2002 he was writing a script with Larry Hagman for a third and final Dallas (1978) reunion.
- He and his wife Carlyn Rosser (1939-2017) first met on a bus. She was 10 years his senior. He always wore his wedding ring throughout the filming of Dallas (1978), even during seasons where his character was unmarried.
- As of Jan. 2000, in 22 years in show business he's only been out of work a total of three weeks.
- Granddaughter Fiona Lee Duffy born summer 2006.
- Son Conor Duffy, graduated from the University of Washington-Seattle in June 2001 with a degree in Drama.
- Two sons Padraic Duffy (b. 1974) and Conor Duffy (b. January 16, 1980).
- His nephew is San Francisco Giant's Cy Young winning pitcher Barry Zito (Duffy's wife is the sister of Zito's mother).
- Earned $75,000 per episode of Dallas (1978), plus $1 million signing bonus (1986-91).
- Graduated from Cascade High School in Everett, WA, in 1967.
- Son Padraic Duffy (b. 1974) played "Mark Harris" on Dallas (1978). "Mark Harris' was the name of Duffy's character on Man from Atlantis (1977).
- As of 2005 was living in Eagle Point, OR.
- Grandson, Maxwell Robert Duffy, born summer 2008.
- Collects antique toys and childrens' books.
- Loves golf and has played in celebrity tournaments.
- As of August 2006 he was being mentioned as a possible candidate for the recast role of "Clint Buchanan" on One Life to Live (1968).
- He attended the University of Washington, Seattle, where he was an actor-in-residence in UW's theatre program.
- In April 2006 he began a ten-week arc playing "Stephen Logan" on The Bold and the Beautiful (1987).
- Father-in-law of Emily Cutler.
- His last name means "black" in Irish, probably referring to black hair.
- Barbara Bel Geddes, who played his TV mother in Dallas (1978), became his surrogate mother, after Patrick's real-life parents had been murdered, in the middle of the 10th season.
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