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In a late interview, Mary Grace Canfield said show creator Jay Sommers was constantly having fights with network executives over her character role, Ralph Monroe, the female construction worker. The executives were worried about people, especially men, believing that a woman could be a blue collar worker. In her first appearance on the show in How to Enlarge a Bedroom (1965), her character's brother Alf Monroe (played by Sid Melton) also says that men generally can't believe a woman could be a blue collar worker, and explains that's why he calls his sister "Ralph" and why they refer to themselves as the Monroe "Brothers." Ralph's real (female) name is never mentioned in the show, though there are several episodes where she tries (with comedic effect) to be more feminine, with no luck. She even marries scatterbrained county agent Hank Kimball (Alvy Moore) in one episode, but the wedding is annulled and Hank explains he doesn't want to be associated with a woman who has a man's name.
Arnold the Piggy was the only cast member to win an award for a performance in a sitcom. He won the coveted "Patsy" Award in 1967, given to the best performance by an animal.
Pat Buttram based his portrayal of Mr. Haney on Tom Parker-- aka "Col. Tom Parker," Elvis Presley's manager--whom he met a decade or so earlier when Parker was a carnival barker.
In 1969, Eva Gabor's dog gave birth to puppies. One was not breathing, so she stuck a hose down his throat, resuscitated, and nursed him to health. She named him Oliver and his sister Lisa.
It was reported that Eddie Albert and Eva Gabor were extremely close friends during the run of the show and the chemistry between them often showed in scenes where they were in close proximity, as one is often always touching the other. Their friendship was said to be very similar to how they played as husband and wife, and when Gabor died on 7/4/95, Albert was extremely devastated and deeply heartbroken. After he died, he was buried only a few yards away from Gabor's resting place in Westwood Village Memorial Park Cemetery in Los Angeles.
There was a false rumor going around that the cast had a luau on the final day of filming and Arnold the Piggy was eaten. Years later, in an interview for a TV Land special, Tom Lester admitted that he made up the story, because he was tired of people asking him almost continuously whatever had happened to Arnold the Piggy.