Continuity mistake: In the opening, when Oliver goes to grab Lisa's hand, he moves his left hand. When the camera looks at Lisa, Oliver is reaching with his right hand.
Green Acres (1965)
1 continuity mistake in show generally
Starring: Eddie Albert, Eva Gabor, Pat Buttram, Tom Lester
Wings Over Hooterville - S2-E1
Factual error: In a flashback scene, Oliver is hanging from a tree after getting shot down in WWII. They ask him where he is from, and he says the US Air Force. The US Air Force wasn't formed till 1947. During WWII, it was the Air Corps.
TV Kiddie Show Host: Sure, I remember that kid, he had on the most realistic looking pig costume I've ever seen. He won first prize.
Oliver Douglas: No, you don't understand, Arnold is a real PIG.
TV Kiddie Show Host: I'll say he is! We had five gallons of ice cream for those kids, and he ate every bit of it himself.
Trivia: Tom Lester made up the story of Arnold the Piggy being eaten on the final day of filming.