When Bart prank calls Moe to get Jimbo in trouble with his crush Laura, he tells him that his street address is 1094 Evergreen Terrace in order to have Moe come over as a scare tactic. However, it is usually listed as 742 Evergreen Terrace.
When Homer is pinching Lisa with the "jealousy bug", the sign behind him changes from a gift store to an antique store.
Marge claims that she's allergic to seafood. But in 'Homer's Night Out' she takes Bart, Lisa and Maggie to dinner at The Rusty Barnacle, a seafood restaurant. She could have developed a seafood allergy in the interim between the episodes.
Marge's pillow disappears while she's talking to Homer about Don Quixote.
Why is Skinner waiting at least twenty minutes of a bathroom stall? There are two doors, meaning two potties and surely the other (not being used to give Bart swirlies) would not be tied up for twenty minutes as well.
Moe knows where Homer lives (and thus the Simpsons' address), as evidenced in several episodes (he has dinner with them in "Grift of the Magi," for example). So Bart's trick shouldn't have worked - Moe should've known that it wasn't anyone by the name of "Jones" prank calling him.
When Homer is gorging himself at the table, the Squeaky Voiced Teen says "That man ate all our shrimp, and two plastic lobsters." After Homer is kicked out of the restaurant, he runs back in and begins gorging himself at the steam trays, one of which (on the left) is filled with shrimp.
Marge's line "As his father, I think you should have..." is grammatically incorrect.