Homer Simpson, Grampa Simpson, Barney Gumble, Krusty the Clown, Groundskeeper Willie, and others
Apu Nahasapeemapetilon, Moe Szyslak, Chief Wiggum, Comic Book Guy, Lou, and others
Mr. Burns, Ned Flanders, Principal Skinner, Waylon Smithers, Kent Brockman, and others
Marge Simpson, Patty Bouvier, and Selma Bouvier
Bart Simpson, Nelson Muntz, Ralph Wiggum, Todd Flanders, and others
Milhouse Van Houten, Rod Flanders, Jimbo Jones, and others
Maude Flanders, Helen Lovejoy, Miss Hoover, and others
When the comet flies over the Springfield city zoo, penguins were seen flying away even though penguins are suppose to be flightless birds.
Comets are mostly made of dust and ice (including the tail), and thus would not make a flaming sound like the Bart Simpson comet did.
When the crowd approaches Ned Flanders on the hill singing "Que Sera Sera," Apu has yellow skin instead of his usual brown skin.
When Bart first discovers the comet, he sees it going to one side toward the left. But the next day, the comet is all of a sudden heading straight for Earth. Comets are unable to change direction like that in a short period of time.
When Kent Brockman says "The following people are gay", these names appear on the screen, most off them work on The Simpsons: Matt Groening, Ken Tsumura, George Meyer, Joel Kuwahara, Bill Oakley, Elizabeth Jacobs, Josh Weinstein, Jane O'Brien, Annette Anderson, Jennifer Crittenden, Mike Scully, Dominique Braud-Stiger, Greg Daniels, Joesph Boucher, Al Jean, Ping Warner, Mike Reiss, Craig Feeney, Richard Raynis, Don Gilbert, David Mirkin, Jacqueline Atkins, Chris Ledesma, Mark McJimsey, David Silverman
When the rocket misses the comet and hits the "Only Bridge Out of Town" sign, what's left of the sign reads: "Bridge Out."
A sign on the side of the rocket reads: ''Caution! Aim Away From Face.''
The newapaper headline reads: ''Rocket To Kick Comet's Tail''.
(as the air raid siren sounds, warning about the comet)
Grampa: (sitting in front of a general store) Sounds like the doomsday whistle! Ain't been blown for nigh onto three years.
Jasper: Tsk, tsk, tsk... trouble a'brewing.
Lisa: I can't believe that extra-thick layer of pollution that I've picketed against is what burned up the comet.
Bart: But what's really amazing, is that this is exactly what Dad said would happen.
Lisa: Yeah, Dad was right ...
Homer: I know, kids. I'm scared too!
Homer: Okay, if you're that worried about it, let's go down to the bomb shelter.
Lisa: We have a bomb shelter?
Homer: Homer Simpson takes care of his family. (cut to Homer banging on a door) Flanders! Open up!
Kent Brockman: Over the years, a newsman learns a number of things that for one reason or another, he just cannot report. It doesn't seem to matter now, so… the following people are gay. (a list of names scrolls past very quickly)
Lisa: It blew up the bridge! We're doomed!
Homer: It's times like this I wish I were a religious man.
Reverend Lovejoy: (running down street) It's all over, people! We don't have a prayer! Argh!
Homer: Lisa, the whole reason we have elected officials is so we don't have to think all the time. Just like that rainforest scare a few years back. Our officials saw there was a problem and they fixed it, didn't they?
Lisa: No, Dad, I don't think--
Homer: Ah-ah! There's that word again.
Mayor Quimby: Fellow citizens, when I learned about the impending crisis, I caught the very next plane to Springfeld ... (security gaurd whispers in his ear) Field.
Homer: And then I sped away without anyone seeing my license plate.
Lisa: Sounds like you had a good day today, Dad.
Homer: Yeah … 'cept I forgot to go to work.
Principal Skinner: Ah, there's nothing more exciting than science. You get all the fun of … sitting still, being quiet, writing down numbers, paying attention … Science has it all.
Radio DJ: Top of the hour, time for the morning news. But of course, there is no news yet, everyone's still asleep in their comfy, comfy beds. Good night, everybody.
Principal Skinner: I'm going to punish you for this, Bart. And it won't just be a simple caning this time. Because you have impeded science, you must now aid science. Yes... Starting tomorrow, you will assist me with my amateur astronomy, taking down coordinates, carrying equipment, and so forth. Four-thirty in the morning.
Bart: There's a four-thirty in the morning now?
(After the comet burns up and Bart catches it.)
Selma: It sure makes you appreciate the preciousness of life.
(The sisters both take big drags on their cigarettes.)
Moe: Hey, uh, I got an idea. We can play a game to pass the time. Er, I'll make the sound of a barnyard animal, and, er, you all try to guess what it is. Ahem. (Makes some unidentifiable noise)
Chief Wiggum: It's a pig!
Bart: It's a cow, man.
Lisa: It's a pony.
Krusty the Clown: No, it's a goat. You know, one of them lady goats.
Selma: There are no lady goats! A lady goat is a sheep.
Dr. Hibbert: I believe she's right.
Otto: You're crazy.
Captain McCallister: Arr, what's it to you?
Otto: What's it to me?
(Everyone starts arguing)
Marge: Stop it! Stop it! Can't you see this barnyard noise guessing game is tearing us apart? Say, Moe, was it a duck?
(Everyone argues again)
Homer: Shut up! Shut up! Stop it! Stop it. I can't take this any more. I can't let that brave man out there die alone. I'm surprised and disgusted by all of you, especially his children. I'm going out there! (Pause) It was a baby ox.
(Citizens of Springfield cram into Ned Flanders bomb shelter.)
Homer: I can't get the door closed. Somebody's going to have to get out.
Lisa: I'd get out but I don't know where I am.
Barney: Hey! Somebody's touching me.
Principal Skinner: I am
Barney (Cheering up) Oh, okay!
Principal Skinner: And now, to top off our most propane explosion free science week ever, our grand finale. The launching of a weather balloon.
Homer: Get out of there. My family needs to use your bomb shelter.
Ned: I kind of figured this might happen, so I built the shelter big enough for both our families.
Homer: No deal. Out.
Homer: So there's a comet. Big deal. It'll burn up in our atmosphere and whatever's left will be no bigger than a chihuahua's head.
Bart: Wow, dad. Maybe you're right.
Homer: Of course I'm right. If I'm not, may we all be horribly crushed from above somehow.
Bart: Race you to Utah, Milhouse!
Superfriends: We are the Superfriends!
Bart: Hey, shut up.
Moe: Let's go burn down the observatory, so this'll never happen again!
Kent Brockman: I've said it before and I'll say it again: Democracy simply doesn't work.
Blackboard Joke: Cursive writing does not mean what I think it does.
Couch Gag: The family comes in as black and white Disney style cartoon characters, complete with Mickey Mouse gloves.
The Three Stooges
Principal Skinner points out the constellation "The Three Wise Men" who look like suspiciously like Larry, Moe, and Curly from The Three Stooges.
Michael Fay Caning
Principal Skinner mentions that Bart's punishment "won't be a simple caning". This is a reference to the highly controversial 1994 caning of American teenager Michael Fay in Singapore. The case was also the basis of "Bart vs. Australia."
Principal Skinner tells Bart he once discovered a comet but it was reported first by Principal Kohoutek. This is a reference to comet C/1973 E1, also known as Kohoutek. Relentlessly hyped as the "comet of the century", it was a notorious disappointment.
The Twilight Zone
The whole concept of people wanting into Flander's shelter and eventually coming in is just like a The Twilight Zone episode named "The Shelter."
Waldo of the famous Where's Waldo? books appears in the episode in the scene where everyone crowds into Flanders' bomb shelter.
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