Continuity mistake: In the scene where Carrie and Miranda are eating cakes outside the shop, talking about Miranda having to be supportive to Steve about his basketball competition, keep an eye on Miranda's cake. She takes bites out of the cake and then when it is down to the last bite, the camera shows Carrie, then shows Miranda again with the cake suddenly full.
Audio problem: Carrie tips her cigarettes into the toilet and flushes it. The shot is looking into the bowl when we hear the flush, but the water doesn't move.
Continuity mistake: When Aidan shows the chair to Carrie he raises his right arm. A shot later it's down.
Continuity mistake: Miranda arrives home and starts opening an envelope. From the opposite angle it is already open and she is already holding the letter.
Continuity mistake: When Carrie and Miranda are eating pink muffins, Miranda's cup in her hand suddenly vanishes.
Visible crew/equipment: When Stanford and Carrie arrive at the furniture place he says "look at this place." Check the reflection on the shop window: There's a boom mic following them.
Continuity mistake: When the chef comes to greet the girls a waiter in a yellow and red shirt is in the back waiting a table. A shot later he is several meters ahead, close to where the chef is.
Continuity mistake: When Charlotte tells about the guy that licked her, Sam has her hands on the table. A shot later they're not.
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen