Visible crew/equipment: When Big arrives at the cafe a moving boom mic is perfectly visible on the glass behind with an arm and a hand moving it.
I heart ny - S4-E18
Visible crew/equipment: Lighting screens are reflected on Sam's sun glasses when she spies Richard.
Visible crew/equipment: When Carrie tells Big that there's no-one she'd like to be except Aidan, two lighting screens get reflected on his glass.
Visible crew/equipment: When Charlotte shows Tray the refurbished bedroom, a squared set light is reflected on the wardrobe.
The real me - S4-E2
Visible crew/equipment: When Carrie shows the Cindy Crawford picture, the filming crew plus lighting screens on the side and on the ceiling are reflected on the bottle.
Hot child in the city - S3-E15
Visible crew/equipment: When Charlotte tells Trey to go to a doctor and she says "What options do we have?", two rectangular bluish lighting screens are reflected on her lenses. Can't be the lamp in front of her because it's vanilla coloured and has a totally different shape.
Visible crew/equipment: When Sam steps off the blue car a big white rectangular object is reflected on the door. Surely some type of filming equipment, for it disappears in the wide angle.
Hot child in the city - S3-E15
Visible crew/equipment: When Wade's parents arrive the camera crane is reflected on the hood.
Visible crew/equipment: At the hotel pool, a boom mic is reflected on Miranda's glasses.
Running with scissors - S3-E11
Visible crew/equipment: During breakfast, when Charlotte asks about upper length gloves, check her lenses reflection: Sam (in front of her) is replaced by a big squared object, most surely the camera.
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.
The turtle and the hare - S1-E9
Visible crew/equipment: While Carrie and Brooke walk down the street, before and after they see Turtletaub the whole filming crew (a man holding a lighting screen, a sound technician wearing headphones and another crew member) plus cranes, tubes and boom mic are reflected on a glass for several seconds.
The turtle and the hare - S1-E9
Visible crew/equipment: Lighting screens reflected on Turtletaub's glasses when Sam says he's got a facial at 3.
The power of female sex - S1-E5
Visible crew/equipment: While having breakfast at the hotel Carrie says "one thing he didn't leave me was his phone number" right then a crew member in red is reflected on the coffee pot, walking around the room.
The man, the myth, the viagra - S2-E8
Visible crew/equipment: When Ed toasts with Samantha and says "a toast to fun" a boom mic is very briefly reflected on his glass.
Visible crew/equipment: Lighting screens reflected on Carrie and Sam's lenses while they have a snack at the flea market.
Take me out to the ballgame - S2-E1
Visible crew/equipment: The girls pick up Sam and when the cab leaves the camera is reflected on the rear window. (Pausing is not necessary at all, but it's fun to pause and check for a huge white sheet behind the camera, which gives away the mistake).
Visible crew/equipment: When Charlotte leaves her apartment building on the way to the party, she puts on large sunglasses. You can see what appears to be camera equipment, in the reflection of the plastic lenses. There are two white squares, which look like a camera light and filter screen. (00:22:20)
Visible crew/equipment: When Sam is with the realtor woman, the boom mic is reflected on her sunglasses.
Visible crew/equipment: When Carrie and Aleksander arrive at the museum, he turns to close the cab door and his back is facing us. You can see the outline of a long cable running vertically down the center of his back, protruding from under his jacket. This cable goes from his neck down to the bottom flap of his jacket, and must be part of his mic. (00:31:00)
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen