When Zack first got the beer, he requested for a coaster so that he would not leave a ring (if he place the beer down). However when Monica announces that the dinner is ready, he placed the beer straight on the table.
Surrogacy, a sperm donor and adoption are not Monica and Chandler's only options. They are discounting IVF. Her inhospitable environment and Chandler's low motility sperm wouldn't matter since the IVF process creates an embryo using her egg and his sperm in a clinical environment which is then re-inserted. IVF was not only a viable option for infertile couples in 2003, it was - and still is - commonplace.
When David offers the vendor a 100,000 Ruble note and says it is worth nothing, based on the exchange rate in 2003, it would have been worth $3400.
Ross tells everyone twice in the coffee house that he may get to give a speech. However, with the arrival of Chandler, it becomes obvious that Ross'd have to repeat the information. Also, he requests his friends to come hear him and also adds that the convention will take place in Barbados.
When Zack asks Monica for a coaster for his drink then proceeds not even to use it when he gets up to go to the bathroom.
When in the dressing rooms, trying to figure out if Charlie could have heard Rachel and Phoebe talking, Phoebe imitates Rachel and says "it's so annoying when I put Emma on the phone to talk with my friends". A woman overhears and agrees that it is annoying when parents put babies on the phone, however this woman had no way of knowing that Emma is Rachel's baby.
When Chandler tells Ross and Joey that Monica's options for pregnancy are adoption and surrogacy, Joey discards learning what surrogacy is. However, on 'The One With Phoebe's Uterus', she clearly explains to Joey and her friends how surrogacy works, so there's no reason for him not to know.
When Ross was trying to reach Charlie, instead of calling Joey at home, he could've just called her cell phone.