Once Upon a Time in Springfield/References

Episode	References	Gags	Appearances	Gallery	Quotes	Credits

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Once Upon a Time in Springfield

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Cultural references

• When Penelope is in Paris, characters Tintin and Captain Haddock from the Belgian comic book series "The Adventures of Tintin" can be seen watching her perform.
• At the end of Penelope's song, she ends in typical Disney princess fashion.

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 that thanked viewers for 450 episodes originally read: "The Best is Yet to Come" at the end. The second time this episode aired changed the last caption to: "Now stay tuned for three Seth MacFarlane cartoons" (referring to Family Guy, The Cleveland Show, and American Dad!) and the syndicated version changed it to: "Think of all the things you could be doing instead of wasting your time with this show."
• Guest star Eartha Kitt is best known for her role as Catwoman, in the 60's Batman series (as Julie Newmar's second replacement, followed by Lee Meriweather in the series' movie). Conversely, fellow guest star Anne Hathaway (Princess Penelope) played Catwoman in the Batman movie The Dark Knight Rises.
• The last time someone called themselves a "star wars" was in "Bart Has Two Mommies".
• This is the first episode where the Simpsons have an HDTV.
• Sophie is, quite surprisingly, absent at her father's wedding. It is possible that her mother kept her from attending or she was not informed of it's occurrence.
• This episode was promoted as the 450th episode, when it's actually the 451st.

Goofs

• When Mr. Burns is offering Homer, Carl and Lenny the donuts, they are colored pink, brown and white. When they eat them, they're all pink.
• When Princess Penelope and Krusty announces their love during the Krusty Show, Penelope is wearing a halterneck dress. But when Krusty is spinning her, the dress cover her entire back.