Homer Simpson: Hey, Marge! Isn't it great being married to somebody who's recklessly impulsive?
Marge Simpson: Actually, it's aged me horribly.
When Russ Cargill appears on the big screen to explain the dome to Springfield, Moe is standing next to Homer and Lisa. A few shots later, Moe is standing next to Lenny and Carl, with different people around him.
When Homer and Bart jump the gorge, the ambulance that crashed into the tree in "Bart the Daredevil" is still there, crashed in the tree.