Revealing mistake: When Bugs Bunny is walking away from Elmer Fudd, you can see a futuristic building in the background that keeps disappearing repeatedly when it reaches the end of the frame.
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More mistakes in The Old Grey Hare
Bugs Bunny: So long, Methuselah.
Trivia: When Elmer finds himself in the year 2000, he picks up a newspaper with a headline saying "Smellevision replaces Television!" Underneath this there is a caption saying "Carl Stalling sez, "It will never work!" Carl Stalling was the music composer and arranger for the Looney Tunes and Merrie Melodies shorts produced by Warner Brothers.