- His friend of many years, Glenn Ford, once told a story of when Edgar was preparing to do some painful dental work on him. The anesthesia consisted of others passing by and allowing the patient, Glenn, to take swallows of whiskey to help ease the pain of the process. About every third drink Glenn took, Edgar took one as well.
- Was originally a dentist with his own practice. At age 38, he turned the practice over to his wife and began his acting career.
- He provided his dentistry skills on the set numerous times. One such occasion, he pulled the tooth of his stand-in of 25 years, Jack Henderson.
- He played the same character (Uncle Joe Carson) on three different series: The Beverly Hillbillies (1962), Petticoat Junction (1963) and Green Acres (1965).
- He appeared in13 movies with Glenn Ford: My Son Is Guilty (1939), Texas (1941), The Desperadoes (1943), Destroyer (1943), Framed (1947), The Man from Colorado (1948), Lust for Gold (1949), Human Desire (1954), The Sheepman (1958), It Started with a Kiss (1959), Cimarron (1960), The Rounders (1965) and The Marshal of Madrid (1971).
- Edgar Buchanan's grandfather, Bramentus L. Buchanan (1840-1904), was a private in Company A, 6th Missouri Cavalry (Union) as well as the Dade County, MO Home Guard (Union) during the American Civil War (1861-1865).
- Was one of only three co-stars of Petticoat Junction (1963) who remained with the series for its entire seven-year run, the others being Linda Henning and Frank Cady.
- His favorite role was in the film Texas (1941), as Buford 'Doc' Thorpe.
- He met his wife at dentistry school in Toronto, where she also studied to become a dentist.
- Member of Theta Chi Fraternity (Alpha Sigma Chapter, University of Oregon)
- In his TV Archives interview, Paul Henning said the reason why Edgar Buchanan was the one who was always holding Higgins in Petticoat Junction is because the dog was too heavy for Bea or the girls to pick up.
- Father of Buck Buchanan, born on April 18, 1946 in Atlanta, GA.
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