My motherboard, my self - S4-E8
Factual error: A motherboard crash would not result in Carrie's losing all of the files on her hard drive. The hard drive can be removed and placed into a peripheral, which can then be accessed by plugging it into a new computer.
My motherboard, my self - S4-E8
Other mistake: When Samantha first has sex with the positions expert, they are supposed to be having sex at a moment where he flips her over but she isn't close enough to him to hide the fact that he isn't inside her.
My motherboard, my self - S4-E8
Continuity mistake: After Carrie is told that her computer is wasted, she is home looking at the phone, which is facing the keys. A shot later it has turned 180ยบ around.
My motherboard, my self - S4-E8
Continuity mistake: When Sam is about to have an orgasm, his lover's hand is on her arm in one shot, but lowered and then reaching for the back in the following shot.
My motherboard, my self - S4-E8
Continuity mistake: When Sam is about to have an orgasm her hair is behind her shoulder in one shot, or over her collarbone in another.
Answer: A popular brand of sexual lubricant. See http://www.k-y.com/index.jsp.
J I Cohen