Continuity mistake: When Berger tells Carrie they must make the bed, her left arm is next to her body. A shot later it's stretched out.
Continuity mistake: Carrie and Berger wake up and he says "We're the couple you wanna be" and her legs are stretched out. A shot later they're bent under her bum.
Continuity mistake: When Carrie wakes up with Berger, her hair covers half of her face and is neatly brushed. From a wide angle it doesn't and it's quite messy.
Continuity mistake: When the lingerie clerk shows the blue dress she holds the clothes hanger from the middle part. From the opposite angle she is holding it from the side.
Continuity mistake: When Sam and Carrie go to the lingerie store, Sam raises her right arm to touch a blue dress. From the opposite shot her arm is lowered.
Continuity mistake: Miranda's pizza is sometimes stiff, others really fluffy, other so-so. Also, the size of the bite changes between shots.
Continuity mistake: While eating a burger, Berger wipes off food from Carrie's mouth and the ketchup bottle magically disappears from the table.
Continuity mistake: While the girls wait for their table, check the apple on Sam's cocktail and you'll notice that the glass' position is inconsistent between shots.
Continuity mistake: Right when the episode starts Carrie is grabbing a long piece of melted cheese that stretches out of her burger into her mouth. Half a second later the burger and cheese have vanished. And her arm is lowered.
Continuity mistake: When Sam sprays whip cream on the guy, she puts a drop by his right nipple and a bunch around his navel. A shot later, cream appears on the right side of his abs. (00:19:50)
Continuity mistake: When Carrie gives Berger his sound machine gift, he either holds it by his side or next to his chest, depending on the shot. (00:26:10)
Continuity mistake: When Carrie and Sam walk down the street and talk about Berger's ex, the passers by differ between the wide and close-up shots.
Continuity mistake: Miranda's baby is definitely not the same baby that appeared in the previous episode.
Continuity mistake: When Miranda takes out the strip of condoms, they swap between falling straight to zigzag shape between shots. Also the way she holds them changes between shots.
Continuity mistake: Charlotte says she has to go to the synagogue and one can see Miranda is holding her glass at chest level. From the opposite angle it is by her mouth.
Continuity mistake: Sam goes to flirt with the waiter while Charlotte has a sip. A shot later her arm is already down, without her having lowered it.
Pick-a-little, talk-a-little - S6-E4
Continuity mistake: When Carrie has dinner with Berger, the position of her right arm swaps between raised or lowered.
Pick-a-little, talk-a-little - S6-E4
Continuity mistake: When Miranda gives some advice to the girls, the passers by behind her disappear in the following shot.
Pick-a-little, talk-a-little - S6-E4
Continuity mistake: When Sam has dinner with Jerry and does the secret service agent fantasy, his hands swap between lying on the table or raised by his face.
Lights, camera, relationship - S6-E5
Continuity mistake: Carrie walks with Berger while she holds an open umbrella next to a window shop. Shot swaps to the inside of the place, she keeps walking by the very same spot but now her arm is lowered and the umbrella is closed. (00:00:45)
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen