The Simpsons

Answer: Because Halloween episodes are not considered part of the Simpsons' series continuity (not that the writers care much about series continuity to start with). I'm surprised that you singled out this particular Halloween episode. Remember the nuclear holocaust, aliens enslaving humanity, or Homer's head becoming a donut? None of them had any lasting effect on the Simpsons' universe either.

J I Cohen

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The Cartridge Family - S9-E5

TV Announcer: The Continental Soccer Association is coming to Springfield. It's all here: fast kicking, low scoring. And ties? You bet.
Bart: Hey Dad, how come you've never taken us to see a soccer game?
Homer: I don't know.
TV Announcer: You'll see all your favorite soccer stars. Like Arriaga, Arriaga II, Barriaga, Aruglia, and Pizzozza.
Homer: Oh, I've never heard of those people.
TV Announcer: And they'll all be signing autographs.
Homer: Woohoo!
TV Announcer: This match will determine once and for all which nation is the greatest on Earth. Mexico or Portugal.

Phaneron

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The Simpsons trivia picture

Trivia: Maggie scans as $847.63 in the supermarket at the beginning (not NRA4EVER, as Troy Maclure asserts in 3F31 "The Simpsons 138th Episode Spectacular), the price it costs to feed and care for the average American baby every month.

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