These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fanon Discontinuity: Some fans who dislike season 11 see this episode as the last one due to its non-canon nature and the alleged revelation of where Springfield is (some versions say it's in northern Kentucky while others say it's in southern Missouri).
Hilarious in Hindsight: Homer mentions performing in a fictional sequel to RENT while split up from the rest of the family. In a later episode, he performs in La Bohème, the opera on which RENT was based.
Also, when the IRS take the Simpsons' mansion away, Homer laments, "They can't take our house; my potbellied pig is in there! Oh, Mr. Porky..." Homer would get another pig for a pet in The Simpsons Movie.