E.T. Go Home: This year's appearance of Kodos and (briefly) Kang took place in this parody of 80's movie E.T. There were some good moments, like Bart watching Itchy & Scratchy dancing on Samba With the Stars, and Kodos slipping in the 'seven million body bags' he would need in the list of items that would help him get back home.
Mr. and Mrs. Simpson: Yeah. This one, a parody of the 2005 hit Mr. and Mrs. Smith, is the story that should not have been part of this episode. Besides Marge and Homer killing everyone along the way what did this really have to do with Halloween?
Heck House: This was the only story that even came close to the creepiness that previous 'Treehouse' episodes displayed. There was a return of Ned Flanders as the devil (we all know that he's a Satanist deep down inside) as well as an appearance by Spider Pig. I liked how the kids did a complete 180 to do tricks instead of receiving treats and that these four individuals alone caused such havoc on Evergreen Terrace.