Sideshow Bob's Last Gleaming/References

References/Trivia

Sideshow Bob's prison number in this episode is A113. A113 is a little known easter egg Brad Bird puts in his movies and films, such as this one, all the Pixar films, two other Simpsons episodes (Krusty Gets Busted and Cape Feare), and many other films and cartoons.
An Alien appers in Hanger 18. This is a refernce to to the Roswell NM ufo crash in the '40s, were it was said that the aliens and spaceship parts were held in Hanger 18 of Wright-Pattrsoin airforce base.

Goofs

Lisa says that helium changes one's voice. However, that is only achieved if helium is absorbed into one's vocal cords. Mere insufflation of helium, as was the case with Sideshow Bob hiding inside the blimp, is too weak to cause the well-known effect. This is shown when the blimp deflates and covers Lisa, her voice does not become higher.
When Sideshow Bob first shows his evil plan on the Jumbo-Vision, his voice is not higher pitched. This is first referenced when the guard says, "I hate that guy and his stupid high-pitched voice."

Colonel Hapablap shouts "Sideshow Bob, what is your major malfunction?!" a la Gunnery Sergeant Hartman (also played by R. Lee Ermey) in Full Metal Jacket.