One of the Homer clones in "Send in the Clones" is the Homer from the early Tracey Ullman shorts. See more...
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The Simpsons (1989) - 6 mistakes in "Bart the General"
Factual error: When Bart declares war on Nelson, Herman uses the declaration from the Franco-Prussian war and puts "Bart" in place of "Otto Von Bismarck". The thing is, Bismarck didn't declare the Franco-Prussian War, Napoleon III of France did. A small error, maybe, but something that a war buff like Herman should know.