Moe states that he moved to Springfield because the Zip Code spells the word "BOOBS". The US Postal Service website reports that there is no Zip Code 80085. However, the reverse (58008) which would spell "BOOBS" if turned upside down, happens to be the Zip Code of the tiny town of Barney, North Dakota.
The opening sequence typically only customised the lines Bart writes on the chalkboard and the couch scene. However, in this we see additional dialogue when: Jedadiah Springfield's head falls on Ralph's head he says, "Was that on purpose?" and when Bart skateboards on Barney's belly he says, "Morning!".
It is revealed that Homer is 39 years-old. When Apu asks Homer how old he is he presumes he is 65, but Homer then tells him he is 39.