Once Upon a Time in Springfield/References

General

References/Trivia

Appearances

Gags

Credits

Quotes

	Season 21 Episode References
← 450 "Thursdays with Abie"	451 "Once Upon a Time in Springfield"	"Million Dollar Maybe" 452 →

Cultural references

• When Penelope is in Paris, the French graphic novel characters from "The Adventures of Tintin" can be seen watching her perform.

Trivia

• This episode aired during the closing celebrations of the Simpsons 20th Anniversary with The Simpsons 20th Anniversary Special in 3-D on Ice.
• The closing caption originally read "The Best is Yet to Come," but was changed when it first aired to "Now stay tuned for three Seth MacFarlane shows," and again in the rerun to "Think of all the things you could be doing instead of wasting your time with this show."