When Ross comes to Central Perk to ask his friends if they've seen his "salmon" colored shirt, the T-shirt he is wearing says "friend" in American Sign Language.
Monica asks where the Bruce Springsteen CD is. Courtney Cox was in a Bruce Springsteen video from the Born in the USA album. The song was Dancing in the Dark.
When Monica goes with Phoebe to the Dry Cleaners they walk past 'Dot's Spot', where Monica previously went on a date with Chip Matthews in 'The One With the Cat' (S4E2).
The Kitchen Aid mixer in Monica's kitchen is pink. It has been yellow until this episode.