The episode "Sleepless in Retroville" becomes a whole lot funnier after watching Jimmy Neutron Happy Family Happy Hour, since both involve aggressive pizza.
The idea of an evil floating pizza face feels somewhat prescient to Pizza Tower as well, which features one as its main antagonistic force.
In "Normal Boy", Cindy wishes that Jimmy would just go to college and leave her and the other students alone. Jimmy would later do just that in "Jimmy Goes to College."
Sheen pretending to be Tee's conscience in "The Incredible Shrinking Town" is funny in light of "League of Villains" (where Sheen is responsible for Tee's Heel–Face Turn).
In "Party at Neutron's", Hugh and Judy leave the house to watch a musical called "Ducks: the Musical". In 2024, there were reports about Pixar working on a movie named "Ducks", which also happens to be a musical.