Continuity mistake: When the girls starts having lunch, Sam's arm is raised then suddenly lowered. (00:12:40)
Continuity mistake: When Carrie and Berger enter the Lincoln Center there's a man behind Berger smoking. When they enter the place a second later, the man has vanished.
Continuity mistake: When Carrie and Miranda talk while sitting on the bench, a couple suddenly appears behind them.
Continuity mistake: When Miranda dines with Steve her menu is lying on the plate or resting on her bosom, depending on the shot.
Continuity mistake: When Carrie's date splashes vinegar on his sty, the position of his left arm is inconsistent in every single shot.
Continuity mistake: When Charlotte tells Carrie to go on the second date, there's quite an editing chaos with Charlotte's glass: It suddenly appears in her hand without her having picked it up. Then she puts it down but a shot later she is drinking again.
Continuity mistake: During lunch at the diner with the girls, Carrie's straw swaps between pointing in a 3 o'clock direction to an 8 o'clock, back and forth.
Continuity mistake: Carrie talks about dating Berger and says "leave it to me... which is flexible" and puts her left hand on her heart. A shot later her arm is lowered by her side.
Continuity mistake: Charlotte tells Harry "you changed your mind with the Jewish thing" while she caresses his chest and his hand is lowered. A shot later his hand is suddenly on his chest and his fingers are entwined with Charlotte's.
Continuity mistake: When Charlotte wakes Harry up, his left hand is on his tummy. From a different angle his hand is by his side and he is rising it again.
Continuity mistake: Steve grabs the baby wipes and leaves none in the box. A shot later a wipe is magically sticking out.
Continuity mistake: When Miranda tries to clean her forehead, the baby's head lies on her collarbone. A shot later the head is away and staring at Steve. Then we go back to the first shot and the baby is lying against the collarbone again.
Continuity mistake: The amount of feces on Miranda's forehead changes between the first time she smudges it on her forehead and half a second later when Steve warns her. This happens before the listed mistake that takes place when he wipes the poo off.
Continuity mistake: While having dinner with Harry, Charlotte grabs her bread and breaks it in half, then eats a bit. From the opposite angle she is grabbing the whole bread again and breaking it in half again.
Continuity mistake: While having lunch at the Meat Packing District, Sam grabs her lipstick but it disappears a shot later.
Continuity mistake: When Carrie exits the Wall Street subway station, the passers-by on the right are not continuous between shots.
Continuity mistake: When Carrie is running, the dalmatian is on the right side of the curb. A shot later it's on the left.
Continuity mistake: When Carrie runs late there's a man with a hat next to some flowers half a meter away. She keeps running and the man vanishes, only to reappear seconds later.
Continuity mistake: After the drinks night, Carrie and Berger start to kiss. He is on top of her and she places her hand on his chest. A shot later it's around his neck. (00:02:35 - 00:24:39)
Continuity mistake: When Sam asks the clerk for specific lingerie, the dress is close to her and she touches it with a her right hand. From the opposite angle her arm is lowered and her left arm holds the dress away from her. (00:13:35)
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen