Phoebe comes over to Joey's apartment and interrupts Joey and Rachel's game of throwing wet paper towels. The number of paper towels and their positions on the entertainment unit constantly change between shots.
When Monica says either Rachel or Phoebe will have to stay at Joey's, they agree Rachel will stay at Monica's. As Rachel goes to sit on the bed, you can see the edge of the set and into the living room/kitchen.
When Rachel is throwing wet paper towels at the cupboard she exclaims "I love it at Joeys!". Joey is mouthing those exact words at the same time she says them.
On Joey's entrance to ask Chandler to ask his college friend for an audition for her movie.
Ross claims not to realize that faculty should not date their students, but in "The One with the Race Car Bed," when Joey says he's teaching a class on soap opera acting, Ross tells Joey that he probably can't date his students.