The Latin phrase under the Springfield University sign ("non loquor latine") means, "I don't speak latin".
The second segment starts with a scene from Cape Feare (1993), but in this version Sideshow Bob kills Bart.
In the second segment Rod is shown to become a prop comic in the future. In the 3rd segment he's reading a book by prop comic Carrot Top.
Kang and Kodos make a non-speaking cameo in the third segment, "Lout Break".
This is the first "Treehouse of Horror" episode to use the animated production by Rough Draft Korea since Treehouse of Horror XXV (2014).