Continuity mistake: The musician leaves a note for Carrie on top of the napkin. A shot later the napkin is inches away and the note is on top of the glass table.
Continuity mistake: When Charlotte asks if Big and Carrie are friends, her fork is pointing upwards or downwards depending on the shot. Also, the pinched omelette appears and disappears randomly.
Continuity mistake: During breakfast, when Carrie says she spent the night with Big, the pancake on Miranda's fork appears and disappears randomly.
Continuity mistake: When Charlotte asks if Tray is her boyfriend or lover, Miranda's fork is lying on the plate or held in his hand, depending on the angle.
Continuity mistake: When Big says "she's a super model" he takes a sip. Then from another angle the glass is away and his head is sunk. Then the shot changes again and his head is back to raised and he is finishing his sip.
Continuity mistake: When Carrie says "there we were, me, my friend...", Maria holds her glass at waist level, but in the close-up she is taking it to her lips.
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen