Postcards from the Wedge/References

References/Trivia

Season 21 Episode References

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"Postcards From the Wedge"

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Cultural references

The title is a reference to the film Postcards from the Edge.
The Itchy & Scratchy cartoon, "Mouse, M.D.", is a parody of House M.D.
The anime cartoon that Bart watches is a parody of Pokémon. Additionally this episode also aired on the same day that Pokémon HeartGold and SoulSilver, the remakes for the Pokémon Gameboy Color games Gold and Silver were released on the Nintendo DS in the United States.
The filmstrip at the beginning contains some classic cartoon sound effects, such as the "pbpbpbpbpbpbpbpb' motors from The Jetsons and the trombone talking of the teachers in the Peanuts specials.
- The music being played in the film strip and during the credits is George Gershwin's "An American in Paris"
Bart and Milhouse both make Thomas the Tank Engine references when they discover the subway.
Mrs. Krabappel says that Bart ruined every ideal she had about teaching since she saw the movie To Sir, with Love as a little girl.
Moe's Express is a parody of Panda Express.
This episode marks a true milestone, as this features the show's first ever true grounding, and the first to stand for the rest of the episode. Prior to this episode, Bart and other child characters would be sent to their rooms, or punished in other ways. This episode is the culmination of the increase in groundings that started in Season 20, with more groundings being used in Seasons 20-21 than the previous 19 Seasons put together.

About 8 minutes into the episode, Lisa's pearls briefly appear red like Marge's, a goof commonly seen in episodes.
When Lisa was explaining her example fraction equation's answer, it is incorrect. 1/2 + 1/3 does not equal 3/anything. It equals 5/6 minimum. However, she could've meant 3/6 + 2/6 instead.
Although the subway system is abandoned, it is still used in various couch gags.