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
David St. Hubbins
Milhouse Van Houten, Rod Flanders, Jimbo Jones, and others
Martin Prince, Sherri, Terri and others
Goof: When Bart is playing the guitar at the bus stop and Nelson appears, the colors of his vest are inverted. He has a blue shirt and an orange vest. They switch back to the normal orange shirt, blue vest when the camera zooms out.
Bart plays the guitar left-handed.
The song Otto is playing on Bart's guitar while they are on the school bus is "Freebird" by Lynyrd Skynyrd.
Seen on Bart's concert t-shirt: "Spinal Tap World Tour: London, Paris, Munich, Springfield."
Homer finds a can of Billy Beer in his jacket.
According to his Driver's License, Otto's full name is Otto Mans and his eyes are listed as black.
Bart's guitar book is called ''Guitar Instruction in 99 Easy Lessons.''
The concert pyrotechnician is missing an arm.
There are bars of gold and jewels underneath the Simpsons' floorboards.
Marge: Otto, you can't watch TV all day.
Otto: You're right. I should do some reading. You got any "Where's Waldo" books?
Otto: A book from a vampire's point of view?
Otto: Anything where guys send in naked pictures of chicks?
Marge: Otto, I think you should get a job.
(Otto starts playing guitar loudly.)
Homer: Will you knock it off!? I can't hear myself think.
Homer's Head: I want some peanuts.
Homer: That's better.
Homer: Of course I'm not mad. If something's hard to do, then it's not worth doing!
Homer: All right, he can stay. But I get to treat him like garbage.
Otto: Wow! What's the catch?
Bart: Mom, I thought you might forget our little conversation this afternoon, so I took the precaution of recording it.
Marge: What conversation?
Bart: (on tape) Mom, can Otto live in our garage for as long as he wants? (impression of Marge) He sure can!
Homer: Marge! What were you thinking?
Marge: That's not my voice!
Homer: Oh, everybody says that when they hear themselves on tape.
Skinner: It's a miracle nobody was hurt.
Otto: I stand on my record. Fifteen crashes and not a single fatality.
Homer: Now, boy, we spent a lot of money, so you'd better get real good real fast, or POW!
Homer: Hey, I thought I was supposed to encourage him.
Kent Brockman: Of course, it would be wrong to suggest this sort of mayhem began with rock-and-roll. After all, there were riots at the premiere of Mozart's "The Magic Flute." So, what's the answer? Ban all music? In this reporter's opinion, the answer, sadly, is 'yes'.
Bart: Hey, Milhouse, cool jacket!
Milhouse: It cost me 50,000 Bazooka Joe comics!
Bart: Rough day, Apu? Help me a squishee and don't spare the syrup.
Apu: Oh, perhaps you would like to try an experimental flavor of my own concoction. A delicious Chutney Squishee.
Bart: Oh... okay…slurp
Apu: You can really taste the chutney!
Otto: Can I at least get my stuff?
Landlord: All I found in there was a jar of mustard and a couple of old Psycho magazines.
Otto: Wow! I have mustard?
Otto: All right, yeah, so how did I do?
Patty: Well you failed every segment, and misspelled bus on your application.
Patty: Ha, ha, ha.
Selma: What's so funny?
Patty: I was just thinking about the time Homer got his nose caught in the toaster.
Selma: We'll watch the tape tonight.
Lou: Let's see your license, pal!
Otto: No can-do, never got one. But if you need proof of my identity I wrote my name on my underwear. Oh wait, these aren't mine!
Nelson: Hey Simpson, what are you trying to play?
Nelson: Oh yeah, well it sounds Polly-Wally-Crappy.
Bart: Mom, I wanna be a rockstar.
Marge: Hmmmmm we'll discuss it later. Is Milhouse okay?
Homer: Uh, I'll be right back....
Spinal Tap: Well, it seems some silly twit did not get a big enough oxygen tank, but that's supposed to be a devil. Filled up with air it's very evil and impressive. We salute you, our half inflated Dark Lord!
Spinal Tap: I just walked out there and there's puddles of water all over the freakin' stage.
Guy: Huh, I don't wanna lie to you boys. Six days a week this place is a hockey rink.
Spinal Tap: Yeah, well this is a rock concert not the bleeding splish splash show.
Homer: Wow, my concert going jacket still fits! And this is where I used to hide my beer. (gasp) Billy beer!
Martin: Although I'm sure I will receive a severe wedgie from my bus-mates, I must remind you that we should have been at school ten minutes ago.
Otto: Uh oh, better fasten your seatbelts little dudes.
Lisa: We don't have seatbelts.
Otto: Uh, well, then just try to go limp.
Otto: I guess I am a bum...
Bart: Homer didn't call you a bum, he called you a sponge.
Otto: SPONGE?! (Punches wall) I'll show him what this sponge can do!
Patty: When you do good, I use the green pen. When you do bad, I use the red pen. Any questions?
Otto: Yeah, one. Have you always been a chick? I mean I don't want to offend you, but you were born a man, weren't you? You can tell me; I'm open-minded.
Patty: (Dropping the green pen) We won't be needing this.
Bart: Otto, you are the coolest adult ever!
Otto: Wow! I've never been called an adult before, but I've been tried as one.
Bart: Otto-Man? You're living in a dumpster?
Otto: Ho, man, I wish. Dumpster-brand trash bins are top-of-the-line. This is just a Trash-Co waste disposal unit.
According to discussion from many of the show's producers, McKean was very painful to work with in the production of this episode.
Otto's original name was going to be "Mechanic," so the joke would be Otto Mechanic.
Blackboard Joke: I will not spin the turtle.
Couch Gag: Santa's Little Helper growls at the family, keeping them from getting to the couch.
While riot police enter the arena to calm down the rowdy crowd, Homer listens to "Spanish Flea" performed by Herb Alpert and the Tijuana Brass. He also sings the lyrics.
Homer: Billy Beer!
A quick and funny reference to one of the many upstart beers to come out of the 1970's (taken off the market due to health concerns), Billy Beer. Billy Carter, former president Jimmy Carter's brother, was hired to promote the beer and at least a portion of the cans bear his signature.
Otto calling Homer "Mr. S" is a quick reference to Happy Days, where the Fonz, Chachi and others call Howard Cunningham "Mr. C."
The rock group Spinal Tap comes from the 1984 mocumentary This Is Spinal Tap. One of the movie's stars was Harry Shearer as Derek Smalls, who in addition to the other voices he does for this series, recreates Derek's voice for this episode.
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