Goof: Rachel says that Ross mentioned asking her out her first night in the city, but it was actually her second night in the city. Rachel's first night in the city, Monica slept with Paul the wine guy, Ross, Joey and Chandler assembled furniture, and Rachel watched Joanie Loves Chachi while clutching her wedding gown. The following morning Rachel made coffee for the first time in her life and went shopping. It was the evening of that second day when she and Ross shared the last Oreo and Ross mentioned maybe asking her out.
Trivia: This is the first episode to mention Rachel's habit of exchanging gifts. This habit becomes a running joke throughout the series.
Goof: When Rachel is on the balcony with her date Carl, a set worker dressed in black is visible on the left side of the screen.
Continuity: Rachel's birthday is inconsistent. In "The One with Joey's New Girlfriend", Rachel tells Gunther her birthday is May 5, and this is consistent with the month of birthday parties thrown for her in this episode (which aired in May 1995) and in her one-month-early surprise party in "The One Where Rachel Smokes" (which aired in April 1999). Rachel's 30th birthday, however, is celebrated in February in "The One Where They All Turn Thirty", which aired on February 8, 2001. Rachel also mentions that her birthday is after Valentine's Day in "The One with the Girl From Poughkeepsie". A birthday in February is also consistent with Rachel's statement to a police officer in "The One with Chandler's Dad" that she is an Aquarius (January 21- February 19).
Trivia: In the hospital, Monica sees a mother go by with twins and says, "No fair! I don't even have one. How come they get two?". Chandler then suggests that if neither of them is married by the time they're forty, why don't they get together and have a baby. What's interesting is that in that simple little exchange their actual future nine years later is defined. They do ultimately end up together and like the woman who just went by, get to have twins.
Trivia: Susan says that Carol's contractions are 55 seconds apart, and Ross says 59 seconds, suggesting that his timing is more accurate because his watch is "Quartz--ha!". Susan trumps him by saying that her watch is "Swiss quartz--ha, ha!". In truth, a four-second difference in their watches in the course of a minute suggests that one of their watches needs repair, regardless of it's advertised accuracy.
Trivia: When Rachel comes back to the hospital and is all dressed up you can see that the shoes she is wearing are identical to the ones Paolo gives her in the episode "The One Where Nana Dies Twice".
Goof: On the sign outside Carol's hospital room, "NURSERY" is spelled "NUSERY".
Continuity: Joey's age is not consistent. In this episode (1995) Joey says he is 25. In "The One Where Joey Moves Out" (1996) Joey says he is 28. In "The One with the Red Sweater" (2001) Chandler says Joey is 32. In "The One with Joe's Fridge", Joey says he went on Spring break in 1981 when he was 13. That would make him 27 in this episode, not 25.
They're tiny and chubby and so sweet to touch,
and soon they'll grow up and resent you so much.
Now they're yelling at you and you don't know why,
and you cry and you cry and you cry.
And you cry and you cry and you cry and you cry...
And they found their bodies the very next day,
they found their bodies the very next day,
La la la, la la la, la la la...
Continuity: In this episode Joey says he is 25, and in the previous episode, "The One with the Ick Factor", Monica said she was 26. However, as the series goes on it is shown that Joey is actually older than Monica and many of the other friends. In "The One Where They All Turn Thirty" we learn that Joey turned 30 before Chandler, and since Chandler is the same age as Ross, Monica's older brother, we can deduce that Joey is also older than Monica in later episodes.
Trivia: This is the first of two episodes in which Chandler gets one of the other friends a job where he works. The other one is "The One with the Chicken Pox", where Joey pretends to be a data processor named "Joseph". In both episodes, Chandler ends up regretting getting his friend a job.
Continuity: In this episode we discover that Monica is 26. However in the next episode, "The One with the Birth", Joey states he is 25. This is an obvious mistake, since it is established that Joey is older than Monica.
Trivia: In this episode and many later episodes, the gang make fun of Chandler for emphasizing the wrong words when he talked. (Could that report be any later?) Chandler had only done this once before on Friends, in "The One With The Butt".
Goof: When Monica is on the phone with the credit card company, the antenna on the phone is only partially extended. However, when she hangs up and goes to put the phone down, the antenna is fully extended.
Trivia: The three casting directors at the end of this episode are really Kevin Bright, Marta Kauffman, and David Crane, the creators/executive producers of Friends.
Trivia: In the dance class, when the real Monica meets the fake Monica, Monica says to her she's Dutch. When they're about to dance Fake Monica asks Monica: "Mag ik deze dans van u?", which is Dutch for, "May I have this dance?"
Goof: When Monica and Fake Monica are telling Rachel about sneaking into a hotel in one shot Monica separates the bread and starts to spread the mayo on it, it then cuts to Fake Monica, and back to Monica and she separates the bread and spreads mayo on it again.
Trivia: In the scene where Ross has just explained to Joey and Chandler that he has to give up Marcel, there is a commercial break. Immediately after the break, the shot shows the three guys sitting on the sofa in the coffee house. If you look at the positions that their hands are in, they are mimicking the "See no evil, Hear no evil, Speak no evil" monkeys.