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.