Revealing mistake: When Tray and Charlotte stand by Tyffany's door, bystanders on the right and on the left sneak-in to see the filming.
Revealing mistake: After Carrie leaves home because Aidan is fixing the floor, Charlotte and Trey walk down the street. There's a group of people on the left who can't stop looking at the camera.
Revealing mistake: When Trey and Charlotte stop in front of Tiffany's, all of the passers-by stare at the camera. There's even a bald man in a white T-shirt who stops dead in his tracks and sneaks his head in between Charlotte and Trey while staring.
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen