The times when the show opened and we saw show credits on newly laid eggs or superimposed over the scene which was noticed and commented on by Lisa as if that sort of thing happens all the time.
The dehydrated dinners Mr. Drucker sold that would spring into hot, full course meals whenever water was added.
The whole Molly Turgis episode, in which the ghost of a dead woman would cause poltergeist phenomena whenever her name was spoken.
The fact that a wooden crate has a "nerve center" that, when struck hard enough, makes the crate fall apart, thereby simplifying the unpacking process.
The talking horse that Mr. Handy brought to the farm once.
The time Eb saw a UFO but whenever he tried to describe it to the military, all that came out was "Bleep, bleep, bleep, bleep!" because the aliens were censoring him.
The time Eleanor the cow swallowed Eb's transistor radio but it kept playing inside her, allowing him to keep track of a guess-the-song contest.
The time the hens laid square eggs.
The time Lisa and Oliver went to Washington and saw the Eiffel Tower outside their hotel window.
And many others.
Maybe the ultimate surreal aspect is how much 1920s culture and technology turns up. Seems that in Hooterville, clothing, vehicles, and appliances are either up-to-date (for the time) or else still in the 1920s, and even before. The 1930s-1950s somehow never left any impression there.
"Truth is its own evidence." - Ralph Waldo Emerson
Eb watching Petticoat Junction, when the characters presumably lived right down the road.
Arnold the pig going to school.
A crown appearing on Oliver's head when he opens a case of margarine.
The Hungarian curse.
Receiving radio signals through the TV.
At least three different stories about how Oliver and Lisa met.
Oliver having an identical double (though every show did this then).
>>>At least three different stories about how Oliver and Lisa met.
But later on in the show, they explained why the stories of how Oliver and Lisa met were different each time.