Goof: In this episode Chandler says that Monica was working on Valentines Day, but in "The One with Rachel's Sister," Ross says that Jill asked him out for Valentines Day. In that episode Monica is sick, not at work.
Factual Error: Ross explains to Chandler that his Saturn V Rocket model is from the Apollo 8 mission and that Apollo 8 did not land on the moon but instead orbited the moon twice and returned safely to earth. In fact, Apollo 8 orbited the moon a total of ten times, not two.
Goof: When Joey shouts at Carl about pizza, Chandler, although backwards, is clearly laughing. However when the camera angle changes, his face is serious.
Goof: When Monica plays "The Way You Look Tonight" on the mix tape, after the first verse the song should go straight onto the second verse. But the song goes into an instrumental verse and Janice's voice is dubbed over.
Goof: When Chandler is in the bedroom trying to make Monica a present, He stretches out a hanger. When the camera angle changes, the hanger is not as stretched as it was before.
Goof: When Gunther tells Joey that a customer has been waiting for his coffee for ten minutes, he hands a mug to Joey. You can clearly see that the mug is empty.
Goof: When Monica got upset over the tape, why would Chandler keep playing it instead of turning it off?
Doctor: (coming into waiting room) Joey and Tony Tribbiani.
Joey: That's us.
Doctor: This is a study for identical twins.
Joey: That's right. Two thousand dollars.
Doctor: But...you're not identical twins.
Joey: (stammers a bit, then yells) DAMMIT, CARL!
Joey: Carl is a guy I hired to be my identical twin for a medical research project.
Chandler: Y'know, sometimes the good ideas are just right in front of you, aren't they?
Joey: Okay, I know it sounds crazy, but I think it might work. Ya know? The only problem is, Carl's acting is… (gestures 'so-so')
Monica: The only problem?!?!
Carl: (entering Monica's)) Hey Mon! Hey Chan! Just getting a soda (does so)
Monica: Who the hell are you?!?!
Carl: I'm Joey! How are you doing?!?
Joey: (running in) No! No! No! No! No! 'How you doin'; how you doin'?' Dammit, Carl! Go wait in the hall.
Look, I got to apologize on the behalf of Carl.
Chandler: Who the hell is Carl?!?!
Joey: Oh; did I not mention?
Rachel & Phoebe: (Jumping out from behind the curtains) Danger!
Rachel: Ah... salmon skin roll.
Chandler: Guys, I need your help, I don't know what to get Monica for Valentine's Day.
Rachel: Well, Valentine's Day was two weeks ago so I wouldn't get her a calendar!
Phoebe: Now we can kick anybody's ass!
Ross: After one class? I don't think so.
Rachel: You wanna see me self-defense myself? Go over there and pretend you're a sexual predator! (Starts screaming) Go on I dare ya!
Ross: Why don't you pick up some extra shift here Joey?
Phoebe: Or, you know, I used to beg for money! Of course, it helps if you have a little of this going on. (Shakes her chest) Wow! I still have it!
Joey: What's with the twenty percent tip? Did I do something wrong?
Chandler: I think that's a generous tip Joe.
Joey: Hey, you know what's more generous than that? Fifty percent! You know what's even more generous than that?
Chandler: I see where you're going!
Chandler: I will cook anything you want in here. (Points to kitchen) And I will do anything you want in there. (Points to bedroom)
Monica: (Points to kitchen) Yeah, you will. (Points to bedroom) And are you kidding me?
Gunther: What did I tell about talking to your friends while you're working?
Joey: Uh, do it?
Gunther: That guy's been waiting for his coffee for ten minutes. He's complained about you three times.
(Gunther hands Joey a cup of coffee and Joey starts drinking it himself)
Joey: (To his friends) So, where was I?
Joey: I gotta get these new headshots done and they're really expensive. I'm down to like three, well, two, because on this one I blackened some teeth . . . why did I do that!?
Ross: Okay, you sensed that was coming, but that still doesn't mean you have unagi.
Rachel: Oh, you know, if we made reservations we could have unagi in about a half hour.
Joey: Well how about this one? Testing the effects of Joey Tribbiani on attractive nurse receptionists.
Receptionist: We already got the results back on that, and they're not good.
Joey: Oh, ha ha ha! Ooh! Wait a minute, I used to get medical experiments done on me all the time!
Chandler: Ah, finally an explanation.
Ross: Hey, remember when I had a monkey?
Ross: Yeah, what, what was I thinking?
Ross: Ah, Chandler I sensed it was you.
Ross: Unagi, I'm totally aware.
Chandler: Okay, so are you aware that unagi is an eel?
Ross: Danger! Danger!
(Phoebe and Rachel scream)
Rachel: What the hell was that?
Ross: A lesson in the importance of Unagi.
Phoebe: You're a freak!
Ross: Perhaps. Now at what point during those girlish screams would you have begun to kick my ass?
Rachel: Okay, so we weren't prepared.
Monica: I'll make you anything you want in there (Points to kitchen) and I'll do anything you want in there (Points to bedroom).
International Episode Titles:
Czech Republic: Síla unagi (Power Unagi)
There is a new opening sequence during the theme song. Clips are added in from different episodes. This happens in almost every 14th episodes throughout all 10 seasons, but in the previous episode "The One That Could Have Been" the whole fountain scene for the opening is changed.
Alternate Title: The One With The Mix Tape
This episode runs 21:46 on DVD (a typical sitcom runs about 22:00).
Phoebe: Pat Sajak?
Phoebe: Alex Trebek?
Rachel: Oh, of course!
Phoebe: Chuck Woolery?
Rachel: Definitely! Phoebe, you will not find a single game show host whose ass I cannot kick.
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