I would watch (and forgive me, I don't know episode names):
The Duff Gardens one (the 7 Duffs are on display)
Any with Kang and Kodos
Krustyland
This is from Orlando Informer:
We want to give you a leg up in that effort. Here are some recommendations for movies and shows you can watch before you make your trip to see it all in person.
The Call of the Simpsons
The Simpsons has run for 26 seasons, and Springfield, USA pays tribute to all of them. Krustyland is a massive feature all by itself, and you can see it in
The Food Wife (episode 491). The statue of Jebediah Springfield is a huge part of Bart’s life in
The Telltale Head (episode 8) from the first season.
However, I recommend that you watch the episode before that one, called
The Call of the Simpsons (episode 7). Still early in Homer’s development as a buffoon and general problem for the family, this episode touches on some common family concerns. Homer’s interaction with the proprietor of Bob’s RV Roundup was an early glimpse at the humor the Simpsons could conjure when presenting a salesmen earning his share.
Homer ends up with a
very modest RV, which doesn’t thrill his family. The show uses Homer’s desire for a nice RV in several episodes, and Universal Orlando gives you a chance to see their newest purchase for yourself. It’s a (little) bit nicer than the one in
Call of the Simpsons, allowing it to carry props and characters from the more than 500 Simpsons episodes that have aired.