We learn how Krumm's father Horvak lost one of his eyes: At the Battle of Lexington, a minuteman mistook the eye for a bullet, and used it to fire the shot that started the American Revolution.
The artist who did the sculpture of Ickis (called "Fear") is named Vincent Van Strough.
It was actually a monster scare that was responsible for people screaming at Beatles concerts.
Title: History of the Monster World...
A takeoff on the 1981 film History of the World, Part I, which is from the comedic genius Mel Brooks. The "Part I" was omitted from the onscreen episode title because it was thought to be misleading. (It is a one-part episode.)