Continuity mistake: When the girls are having breakfast a server off-screen is picking up the plates, but in the wide angle they disappear.
Continuity mistake: Miranda says "I can't believe you went on a honeymoon without us" and then Carrie's right arm is suddenly raised holding her head.
Continuity mistake: When the show starts, Carrie puts a pair of shoes in the suitcase, leaving a second pair next to her clothes. Shot changes and that second pair is now sticking out in a different position.
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen