- Regularly drove approximately 40 miles from her home on Woodrow Wilson Drive in the Laurel Canyon section of the Hollywood Hills to the Malibu home of Julia Phillips so they could play the card game canasta during the early 1970s. Phillips, who resided with her husband on Nicholas Beach Road in the Trancas Highlands section of Malibu during that era, later devoted four pages to the singer in the bestselling book "You'll Never Eat Lunch in This Town Again". Phillips also claimed the singer hated the IRS and paid an outstanding debt of $10,000 to this government agency with a truckload of pennies that she arranged to leave outside its office near the 405 freeway in the Westwood section of Los Angeles. Phillips continued the story on page 154 of the book: "It was a costly joke -- finding the pennies and the truck large enough to do it cost her another three grand, not to mention being cited by the government for contempt and having to collect the pennies and remove them. All in all she came out about even. That was how it was with Cass. If she broke even, she was having fun.".
- Died in the same room, No. 12 at 9 Curzon Place in London, where The Who drummer Keith Moon died four years later. Musician Harry Nilsson was the leaseholder; after Moon's death, Nilsson sold the lease.
- An urban legend arose that she died choking on a ham sandwich because a partially eaten ham sandwich was found by her bed. When police were asked the cause of death prior to an autopsy, they speculated that she either died of a heart attack or choked to death on a ham sandwich, but she officially died of a heart attack. The autopsy revealed that a full third of her heart muscle had degenerated; bandmate Denny Doherty said later "Cassie literally died of a broken heart.".
- Had an IQ of 165.
- Ranked #23 on VH1's 100 Greatest Women of Rock N Roll
- Older sister of Leah Kunkel.
- Mother of Owen Elliot-Kugell, whose father's name she never revealed to anyone. Michelle Phillips helped Owen find her biological father.
- Assumed the surname Elliot in memory of a dead friend.
- She was posthumously inducted into the Rock and Roll Hall of Fame, along with the other Mamas and Papas, in 1998. Her award was accepted by her daughter, Owen Elliot-Kugell.
- Was instrumental in the formation of Crosby Stills & Nash. According to legend, the trio first performed in the kitchen of her house in Laurel Canyon.
- Her last appearance on American television was on the quiz show Celebrity Sweepstakes (1974).
- She auditioned for the "Miss Marmelstein" stage role in "I Can Get It for You Wholesale" but lost out to Barbra Streisand.
- Posed nude for Cheetah magazine.
- She actually preferred classical music, jazz and Broadway show tunes to rock.
- The Crosby Stills & Nash Greatest Hits album was dedicated to her (2005).
- Following her untimely death, she was interred at Mount Sinai Memorial Park in Los Angeles, California - Court of Tanach, Lot 5000, Grave 2F.
- Is credited with helping to assemble the bands The Lovin' Spoonful and Crosby Stills Nash & Young.
- Hated being called 'Mama' Cass, which she took as a derogatory comment on her 300+ poundage. Additionally, it bothered her that the moniker led many to mistakenly assume Cass was her last name.
- Recording six albums after she went solo, she teamed briefly (and unsuccessfully) in 1971 with musician Dave Mason.
- A member of the folk group "The Mugwumps" before hitting it big, she married one of its members, Jim Hendricks, to help him avoid the draft. The marriage was never consummated and was later annulled.
- Her sister, Leah Kunkel, became the legal guardian of her daughter, Owen Elliot-Kugell (born 26 April 1967), upon her death in 1974.
- She was posthumously awarded a Star on the Hollywood Walk of Fame for Recording at 7065 Hollywood Boulevard in Hollywood, California on October 3, 2022. Michelle Phillips, John Sebastian, Leah Kunkel and Owen Elliot-Kugell were guest speakers at the ceremony.
- Formed the short-lived duo, "Mason and Cass", with former Traffic guitarist/vocalist Dave Mason.
- As a solo artist, she hired Allan Carr as her personal manager in 1973.
- Aunt of Nathaniel Kunkel.
- Ex-sister-in-law of Russ Kunkel.
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