This is a grand misuse of the spoiler tag, but I’ll bite.
Jerry Lewis did do the voice of Frink’s father. He’s older (and chubbier) now, so I guess he can’t do his Nutty Professor voice that Frink Jr. parodies.
My favorite segment of the three was Stop the World, I Want To Goof Off! The idea of Bart and Milhouse with a watch that can freeze time is a simple one, but can cause great hilarity. Especially funny was the scene in which they strip Homer, bring Nelson in to say his famous line, and then strip him before he can finish it.
The opening sequence was very funny, and a good example of the non-canonical mayhem that can be done in a Halloween episode. (The mayhem started when Lisa stole a Butterfinger from Bart. I guess he was right when he said to never lay a finger on them.) Grampa, set on fire: “I’m still cold.” And the scene following, poking fun at a Halloween show in November, was inspired.
Hopefully, the Simpsons are back in the swing of things. (I laughed long and hard at a line in the preview for next week’s show. Something about Homer hiding his mother in the most deserted place he knows-Disney’s California Adventure.)