Alec Baldwin guest stars as Parker, Phoebe's date. Before heading out to the Gellars' 35th wedding anniversary, Parker inquires about the location of the anniversary party. Monica tells him it's in Massapequa. Parker says he's never been there. In real life, Alec Baldwin was born in Massapequa.
In the picture of the Gellers at the anniversary, they are wearing the exact same outfits as they are at the party.
In the photo of Jack and Judy Geller that is at the anniversary party, not only are they wearing the same clothes that they are at the party, if you look closely, they are also standing in Monica and Chandler's kitchen (in front of the refrigerator).
Alec Baldwin who plays Phoebe's date is actually distantly related to four of the main cast members. He shares common ancestry through the Baldwin's with Courteney Cox and Matthew Perry and is also related in varying degrees to Matt LeBlanc and Jennifer Aniston as well.
Rachel tells Ross that the fake wedding she describes to the party guests "may be the only wedding" she ever has. However she technically planned and had a previous wedding: the one to Barry that she ran out of in the events of the pilot episode. Also, she married Ross in Vegas.