Continuity mistake: When breakfasting, Sam pinches a blackberry but it disappears half a second later.
Continuity mistake: Carrie places a thick blue book on the right side of the fireplace, but a shot later it appears on the far left side.
Continuity mistake: After Charlotte twirls her drink swaps hands between shots.
Continuity mistake: In the duck pond, Big's wet hairstyle changes between shots. Also Carrie's, from soaking wet and straight to slightly curled.
Continuity mistake: While unpacking at Charlotte's place, she holds one candle in one shot, but they suddenly become two a second later.
Continuity mistake: Books on top of Charlotte's fireplace fall down between shots. (00:10:02)
Continuity mistake: At Charlotte's, Sam reaches for the Martini on the fireplace and turns around. A shot later she is reaching again for the Martini and turning around again.
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen