- Directed seven actors to Oscar nominations: Jack Lemmon, Jack Gilford, Burgess Meredith, Sylvester Stallone, Talia Shire, Pat Morita and Burt Young. Lemmon won Best Actor prizes for Save the Tiger (1973).
- Was going to direct Serpico (1973), but was replaced just before filming due to differences with the producer.
- Declined to direct Rocky II (1979).
- Died a month and a half before the release of John G. Avildsen: King of the Underdogs (2017), a documentary about his life, career and films, directed by Derek Wayne Johnson.
- He was the original director of Saturday Night Fever (1977) but pulled out. He was replaced by John Badham.
- His son Ashley Avildsen is the creator and owner of the metal label Sumerian Records. He has no relationship with his son nor has he ever attempted to make contact.
- Father of actors Jonathan Avildsen and Anthony G. Avildsen, both of whom have appeared in several of his movies and also worked for him as production assistants.
- Despite a popular misconception, Avildsen was *never* approached to direct "The Next Karate Kid" (which came out the same year as his movie "8 Seconds").
- Has a daughter named Bridget Avildsen (b. 2 October 1993) with his ex-wife, Tracy Brooks Swope.
- As of 2003 was living in Beverly Hills, CA.
- He has directed one film that has been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: Rocky (1976).
- Remained close to famed New York City cop Frank Serpico, the subject of the 1973 film Serpico which Avildsen was fired from. The two even shared a Long Island beach house for three years in the 1980s.
- Ex-son-in-law of Herbert B. Swope Jr. and Margaret Hayes.
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