In the alternate reality, the hair clip that Monica is wearing when Chandler tells her that he wants to be her boyfriend is the same one that she wears in The One With Ross's Wedding, Part 2 after they have sex for the first time in London.
There's some nice guys at my office, do you want me to set you up? But no accountants. And no one from, like, legal. I don't like guys with boring jobs." "Oh and Ross was like what? A lion tamer?" - Rachel and Chandler, Friends