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."
• The last time someone was dressed up as a Star Wars character and said "I'm a Star Wars" was in Bart Has Two Mommies.

Goofs

• When Lenny says "Sir, I'm afraid it's too late", the words don't match the movements of his mouth.

← Season 20 Season 21 References Season 22 →

Homer the Whopper • Bart Gets a "Z" • The Great Wife Hope • Treehouse of Horror XX • The Devil Wears Nada • Pranks and Greens • Rednecks and Broomsticks • Oh Brother, Where Bart Thou? • Thursdays with Abie • Once Upon a Time in Springfield • Million Dollar Maybe • Boy Meets Curl • The Color Yellow • Postcards from the Wedge • Stealing First Base • The Greatest Story Ever D'ohed • American History X-cellent • Chief of Hearts • The Squirt and the Whale • To Surveil with Love • Moe Letter Blues • The Bob Next Door • Judge Me Tender