An Open Book - S1-E5
Continuity mistake: When Claire is lying on her bed studying, in the long shot we see an open ring binder and open book on the bed in front of her a few inches apart. The shot cuts to a close up and the book is now on top of the binder.
An Open Book - S1-E5
Continuity mistake: During the scene where the four women are eating KFC, Hannah has her hands by her mouth and is not holding any food. The shot cuts, and her hands are suddenly much lower, and she has a piece of chicken in each hand.
An Open Book - S1-E5
Continuity mistake: When Nate and Brenda are kissing in the pool, Nate's hair changes between shots. Sometimes there is a section of hair dampened down onto his forehead, which vanishes in other shots.
An Open Book - S1-E5
Continuity mistake: When Nate and Brenda are arguing, just after Brenda sits in the chair, we see from behind that her left hand which is holding a cigarette is held up by her face. The shot cuts to a view from in front and her hand is instantly in her lap.
Answer: Nate actually say "You can't take a picture of this, it's already gone." It's kinda hard to explain, but he's referring to the fact that the moment Claire wants to take a picture of is over already, and she can't take a photo of it, just a different, lesser moment.