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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Tree House of Horror X - S11-E4

[The Simpsons are driving down a road as fast as possible.]
Homer: Dear God, it's Homer. If you really love me you'll save my life now.
[The gas needle immediately drops to empty and the car stops.]
Homer: D'oh.

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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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