Continuity mistake: When Carrie is lying on her bed, she is wearing yellow pants over a green top. The top portion of her pants is unbuttoned/unzipped as she moves. But after she picks up the phone to call Big, she is sitting up on her bed, and her pants are suddenly buttoned/zipped completely up. There was no opportunity in this sequence for her to have closed her pants. (00:12:15)
Continuity mistake: When Sam has her smoothie-remedy in front, it has a centimetre of bubbles on top in the wide close-ups, but none in the wide angles.
Continuity mistake: Charlotte asks Trey for the guest list and he hands it to her wit his left hand. A shot later he holds it with his right hand.
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen