The Springfield Files/References

References/Trivia

Cultural references

When Homer says "a movie about a bus that had to speed around the city, keeping its speed over fifty" he is refering to the 1994 "Speed" film.
Much of the episode contains references to TV show The X-Files. Mulder and Scully are FBI agents from the series, and are voiced by their actors. The Cigarette Smoking Man from the show also appears. The show's theme song plays when the 'alien' appears. Also the photo of Mulder in a speedo shown in his FBI badge is a reference to an episode of the series where Mulder is shown wearing one.
When Homer is asked to identify which alien he saw, the line-up includes Marvin the Martian (Warner Bros.), Gort (from The Day the Earth Stood Still), Chewbacca (from Star Wars), either Kang or Kodos, and ALF.

The Line up - This is considered the most illegal scene in Simpsons' history

After Homer is been examined by Scully and Mulder, a view on Moe's Tavern is shown with brief description, after which "ALL WORK AND NO PLAY MAKES JACK A DULL BOY" text is repeatedly written on screen. This refers to famous scene from "The Shining" by Stanley Kubrick.
The bus of musicians that Homer encounters while in the woods play the music from the shower scene in the movie Psycho.
The Budwiser Frogs appear in the lake near the woods before getting eaten by a gator that says Coors which is the name of another beer company.
Leonard Nimoy's appearance references the show In Search Of which he hosted.

Grampa calls a tortoise a turtle. However, this may be due to his senility, not a goof.