So in the episode where they go to Vegas to surprise Joey, Rachel is talking about having a night alone, and Phoebe is all, "Uh huh, naked alone time." And then they say that she lives alone, and mention whether or not she walks around naked and she's like, "Why do you think it takes me so long to answer the door?" And then a couple episodes later (tow Ross's denial) Rachel asks to live with Phoebe, and Phoebe is all, "DENISE DENISE!!!!" As if she's been living with her for a long time??