500 Keys/References

References/Trivia

Season 22 Episode References

←

484

485
"500 Keys"

Cultural references

When Lisa finds the hidden classroom in the basement of Springfield Elementary School:
- She observes that the stage is set for a production of the play Endgame by Samuel Beckett.
- The objects in the classroom appear real, but on closer inspection Lisa discovers that they are fake. Near the end of 2001: A Space Odyssey, astronaut David Bowman finds himself in a similarly fabricated hotel room.
- Lisa returns to the classroom with a huge crowd and school newspaper reporters in tow, only to find nothing but bookshelves, similar to the Geraldo Rivera special The Mystery of Al Capone's Vaults, where after a huge media buildup the vault was anticlimactically discovered to be empty except for dirt and debris.
When Bart gets onto the window washing platform, the music playing is an inversion of the title theme from Peter and the Wolf.
During the blimp pursuit (Chief Wiggum and Lou in the Springfield Police Department blimp chasing Homer in the Duff Beer blimp):
- Homer eludes Wiggum by suddenly climbing and flying over a billboard advertising a Cirque du Soleil performance titled "Zoomanity".
- Wiggum crashes into the billboard and cries "Oh, the zoomanity!" as his blimp catches fire, referencing the Hindenburg disaster.

The chalkboard gag is a reference to Kristen Schaal's name being misspelled as "Kristen Schall" in the closing credits of "Homer Scissorhands".
- This is the second time an episode's chalkboard gag has referred to the immediately preceding episode. The first was in "Homer the Heretic", where the chalkboard gag "I will not defame New Orleans" referred to complaints the show received about a song about New Orleans in the previous episode, "A Streetcar Named Marge".
In the band room scene of the opening sequence, Lisa plays a violin instead of her saxophone.
When Lisa first finds the hidden classroom, a hamster ball with a skeleton inside it is briefly seen. Whether it's Nibbles or another hamster isn't known.
Nelson carves his trademark laugh out of wood in shop class.
Homer's car registration says "NABF14", the production code for this episode.
One of the mannequins inside Bus 23 resembles Janey.

The track of Bus 23 can be seen going into the river, but when Lisa falls there is a track on the other side. However, this could explain that the bus made its way over the ice bridge, but fell into the river backwards.