Catastrophe in Substitute Springfields!/References

Cultural references

 * The story's title is a reference to the "" storyline from.
 * In the story's opening text, the imperfect duplicates are referred to as "Berzerkos", which is a play on, a DC Comics villain who is an imperfect clone of Superman and who often speaks in opposites. Bizarro also appears briefly as the Homer clone begins mutating.
 * On the last page, when the panel displays all of the substitute Springfieldians, a substitute appears that looks remarkably similar to Fry from Futurama, Groening's other television series.
 * Kang and Kodos' miniature city in a bottle is a reference to from the Superman comics, a Kryptonian city best known for being shrunk and captured by the supervillain Brainiac.