There was a bit of irony, some would even say karma, in Petticoat Junction being replaced in its final time slot by the Mary Tyler Moore show in 1970. You see, some 12 years earlier Cloris Leachman was replaced as co-star on the long-running Lassie series by one June Lockhart. Fast-forward to 1970 and Ms. Lockhart is co-starring on PJ as Dr. Janet Craig (had been since, in filming order, just prior to original star Bea Benaderet's death). When that show is cancelled, the new program that takes its old time slot had among its co-stars . . . Cloris Leachman.
As for Linda Kaye Henning, who only missed one show (due to a bout with mononucleosis during the filming of the "Bobbie Jo and the Beatnik" episode in Season 1), and thus is second only to Edgar Buchanan in total episode appearances - because of her being billed as "Linda Kaye" in the show's first five seasons (a part in-joke homage to rubber-limbed, fast-talking dialectist [and fellow redhead] Danny Kaye who hosted an Emmy-winning but ratings-challenged comedy/variety hour bearing his name on CBS from 1963 to '67), in the 1990's some of her credits were mixed up in some reference books and online with another Linda Kaye who was a stuntwoman during that period - and who had small roles in two Quentin Tarantino movies (Reservoir Dogs as a "Shocked Woman" and Pulp Fiction as a "Shot Woman").
But let's not forget the other two girls who were part of the show in its first two (B&W) seasons - Jeannine Riley (Billie Jo #1) and Pat Woodell (Bobbie Jo #1) - the latter of whom also voiced "Bunny" in Warner Bros.-7 Arts' very short-lived "Bunny & Claude" cartoon series of 1968-69 which featured rabbit versions of Bonnie and Clyde.
Another thing about Ms. Woodell: In 1962-63 she was a Warners' contract player, who made guest appearances in a handful of Warners'-produced TV shows - and was in a Jack Webb-produced and -narrated propaganda flick originally released as Red Nightmare and, many years later, reissued under the title The Commies Are Coming, The Commies Are Coming (and because of its subject matter, for years mis-dated as 1957 instead of 1962).
As for Ms. Hutton's absences from several of the episodes from the one season she was in: Early on during production, she had a bout with hepatitis (I can't say for sure whether this spurred an interest in physical fitness that manifested itself in her "Nurse Goodbody" character on Hee Haw on which she was a regular for many years).
