I kind of rediscovered Green Acres when TV Land ran that marathon a couple of years ago. I still stop for it whenever I'm channel-flipping and it's there.
Green Acres had a surreal quality to it, and the real plot of each episode was to see how long it would take to drive Oliver Wendell Douglas crazy. There were two primary running gags. One would be to have totally unrelated characters (i.e., their paths hadn't crossed in the story) come up to him and ask him things like, "Say, are you hung over?", to which he'd respond in an increasingly testy manner, "I am NOT hung over!") The other, of course, was the impossible stuff, like Arnold going to college or Lisa's chickens laying square eggs ("How could a chicken---?").
What made those silly gags work was Eddie Albert's increasingly perplexed reaction to them. That's what really sold the jokes, and that's the way I'll always remember him.
Does anybody also recall a good but short-lived series Eddie Albert was in with Robert Wagner called Switch?