This is the second time one of the friend's regular outfit is thought to be a costume. In this episode Ursula insinuates that Phoebe's outfit is her halloween costume and in "The One With The Holiday Armadillo" the man at the costume shop asks Ross if he is there to return the pants he is wearing.
It's unusual how they all agree Ross could win against Chandler and then in the season 7 episode Monica and Chandler's wedding when Ross tells Chandler he would kick his ass they all laugh it off.
Goof: When Rachel comes back to the party and talks to Joey, Joey picks up a piece of food and sets it back down. When the camera angle changes, he is suddenly eating something.
Goof: Throughout the episode the size of Chandler's carrot keeps changing in between shots.
Goof: When Phoebe meets Ursula's fiance, he takes a napkin to wipe the sweat out of his right eye. When the shot changes, he's wiping his left eye. When he starts wiping his forehead, the shot changes and suddenly he's wiping his eye again.
Trivia: Chandler's favorite book as a child was The Velveteen Rabbit. That was also his old girlfriend Kathy's favorite book.
Continuity: In this episode, Monica and Chandler are arm wrestling, and seem to be at about the same level of strength. Yet, in other episodes, all the characters admit Monica is "freakishly strong."
Monica: (When Joey comes in wearing a sweater vest and khakis) You didn't dress up either?
Joey: Yes I did. I'm Chandler. (Sees Chandler's costume) Dude, what happened?
Chandler: How is that me?
Joey: Okay. I'm Chandler. Blah!!
Phoebe: (Laughing, pointing at Chandler) That is so you!
Chandler: When have I ever done that?
Joey: (Imitating Chandler) When have I ever done that? Blah!
Monica: Joey, you read comic books, right?
Joey: Who do you think would win in a fight between Ross and Chandler?
Monica: I can't answer that! Chandler's my husband.
Joey: So Ross?
Monica: I know it's last minute, but we decided to have a Halloween party.
Phoebe: Oh good!
Monica: And everybody has to wear costumes. (General discontent) Come on! It'll be fun!
Ross: Well, I'll be there. I mean, I have to wear a costume to all my classes that day anyway so...
Rachel: Please, tell me you're not gonna dress up like a dinosaur.
Ross: Not two years in a row.
Phoebe: Okay, I can't let you do this! She's lying to you.
Phoebe: She is lying! And I bet I can prove it. Excuse me. (She grabs Ursula's purse, goes through it, and finds some papers.) Okay. Okay. Yeah, not a prayer chain, but what looks like a detailed drawing of a bank floor plan.
Monica: (about Rachel's costume) What are you?
Rachel: I am a woman who spent a lot of money on a dress because pretty soon, she won't be able to fit into it.
Monica: Oh. I'm Catwoman, who wants to borrow the dress when you're too big for it.
Chandler: You're going down.
Ross: Oh yeah? You're going further down! Downtown!
Joey: Seriously guys, the trash talk is embarrassing.
Monica: Oh really? Okay? Well what would you say if I told you that, ya know, Ross or Chandler could beat you up?
Joey: I would say, "Woman, please!"
Chandler: Prove it!
Ross: Oh, I'll prove it. I'll prove it like a theorem.
Eric: I am so stupid. Of course she's lying; she's not a teacher. There's no such thing as the "Top Secret Elementary School for the Children of Spies."
Monica: It was either a pink bunny, or no bunny at all.
Chandler: No bunny at all! Always no bunny at all!
Joey: Halloween is so stupid. Dressing up and pretending to be someone you're not.
Chandler: You're an actor!
Monica: Hey, Ross.
Monica: What are you supposed to be dressed up as?
Ross: Oh, well, you remember the russian satellite Sputnik? Well, I am a potato or a spud and here are my antenna. so?
Ross: I'm Spudnik. Spudnik!
Chandler: Wow, I don't have the worst costume anymore.
Mona: (About Ross and Chandler arm-wrestling) Wow. They're both really strong.
Joey: Or equally weak.
Rachel: Oh, I am just awful with children.
Joey: Come on, you're good with kids. They're just crazy on Halloween. You know, they're all greedy and hopped-up on sugar.
Rachel: Really? You think that's all it is?
Joey: Absolutely. Halloween is the worst. Except for Christmas. And their birthdays. They kinda get a little crazy during the summer, too. And anytime they're hungry or sleepy. Yeah, kids are tough. Good luck with that.
Phoebe: The only reason he's marrying you is because he thinks all the things you were saying about yourself are true.
Ursula: Well, they could be true.
Phoebe: But they're not.
Ursula: Yeah. It's a fine line, huh?
Phoebe: Ah, Catwoman. So we meet again.
Monica: So we do, Supergirl.
Phoebe: No, it's me. Phoebe!
Chandler: Hey, Joey is gonna be thrilled, he was hoping you'd come by as a slutty nurse.
Mona: Um, actually I'm just a nurse.
Chandler: Huh, you'd think that'd embarass me, but as you can see (Points at his pink bunny costume) I'm maxed out!
Eric: I teach the second grade.
Phoebe: I love the second grade!
Phoebe: Yeah, it's so much better than first grade, when you don't know what's going on. And definitely better than third grade. You know, with the politics and the mind games.
Rachel: Monica, we need more candy.
Monica: There've only been, like, four kids.
Rachel: I know, but one of them just said she loved me, so I just gave her everything.
Phoebe: No wonder you're pregnant.
International Episode Title:
France: Celui qui perturbait Halloween (The One Who Messed Up With Halloween)
When playing both Phoebe and Ursula, Lisa Kudrow's sister doubles for the shoulder shots.
This episode received an Emmy nomination for Outstanding Multi-Camera Picture Editing for a Series (Kenny Tintorri).
Also, this episode was nominated for a Hollywood Makeup Artist and Hair Stylist Guild Award for Best Contemporary Makeup in Television (For a Single Episode of a Regular Series - Sitcom, Drama or Daytime).
This episode marks the final appearance of Ursula, played by Lisa Kudrow.
This episode runs 22:18 on DVD (a typical sitcom runs about 22:00).
Gunther comes to the party dressed as Charlie Brown. Charlie Brown is the lead character in the Peanuts comics created by Charles Schultz.
Chandler: Howdy, doodie.
This is a reference to the children's television show Howdy Doody.
Rachel: I don't suppose you saw the cover of British Vogue?
Vogue is a fashion magazine that is published in several countries, including Britain and the United States.
Phoebe: Catwoman. So we meet again.
Monica: So we do, Supergirl.
Supergirl is a fictional character from the Superman series, published by DC Comics.
Catwoman is a fictional character from the Batman series, published by DC Comics.
Ross: Remember the Russian satellite, Sputnik?
The Russian satellite Sputnik was launched on October 4, 1957. It was the first artificial satellite to orbit the Earth.
Joey: Leatherface from Texas Chain Saw Massacre! No wait, slutty Leatherface!
Texas Chain Saw Massacre is a horror movie from 1974, and remade in 2003. The murderous character Leatherface is rumored to have been based on real-life serial killer Ed Gein.
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