Quite true.

Another possible connection would be that Groundskeeper Willie killed Maggie (In "The Others" when outside, Willie is dragging Bart and Lisa's dead bodies away) as revenge from Maggie axing him in the back in "Time And Punishment" (ToH V). See his shifty eyes when Bart asks Lisa who killed Maggie.

Yep. True. I think it was a favorite, too.

The "barely glimpsed" simpsons at the end are the Animalized simpsons from Treehouse of Horror 13's "The Island of Dr. Hibbert".