Krusty: Ooh! Sex Chat! (dials)
Voice: You've reached the Party Line! In a moment, you'll be connected to a hot party, with some of the world's most beautiful women! Now, let's join the party!
Man 1: Hello?
Man 2: Hello?
Apu: Are there any women here?
Apu: Are you a beautiful woman?
Krusty: Do I sound like a beautiful woman?
Apu: This is not as hot a party as I anticipated.
Lovejoy: I do a radio call-in show with him every Sunday night!
Lisa: I didn't know that.
Lovejoy: Gee, uh, I mention it in my sermon every week.
Bart: Oh, oh, that radio show!
Lisa: Oh yeah! It's all the kids talk about on Monday at school.
Lovejoy: Oh, well, why don’t you have a free t-shirt. You'll be the coolest kids in the playground!
Bart: He, he we'll put ‘em on later -- now.
Bart: Hello, my name's Dimitri. I'm a first-time caller, long-time listener. My question is, if a son defies his father and chooses a career that makes millions of children happy; shouldn't the father forgive the son?
Lovejoy: I think so.
Msgr. D: Yes, of course.
Rabbi Krustofsky: No way! Absolutely not! Never, never! Who screens these calls? Who's in charge here? There's nobody in charge? They leave a building without people watching it..
Krusty: (Singing) Oh Mein Papa, to me he was so wonderful, Oh Mein Papa, to me he was so good, no one could be, so gentle and so loveable, Oh Mein Papa he always understood!
Moe: I've got something in my eye.
Barney: Here, take my hanky.
When Krusty has a cigarette during the cartoon just before he is reunited with his dad, he keeps his pack of cigarettes in his shirt pocket. When Krusty and his father hug, the cigarette and the pack are both gone.
When Krusty rings his father, there are glasses on the bedside table but in the next shot, they're gone. All the other objects on the table are also gone.
When Krusty dials '1-909-SEX-CHAT,' he presses '90190' on the phone.
Like Father Like Son
The title is a play on the phrase, "Like Father Like Son."
The Jazz Singer
The entire plot--Krusty's struggles with estrangement from his rabbinical father who disapproved of his career as an entertainer--is based on the 1952 film.