Continuity mistake: Fixing the first martinis, Emily is pouring from the mixer in one shot, and in the reverse angle she's already with both hands doing the finishing touches to the glasses. (00:11:20)
Continuity mistake: When Sean is introduced for the first time, there's an obvious continuity issue with Blake Lively's hair over her right shoulder. (00:12:00)
Continuity mistake: While they are talking about the swear jar, Emily removes the right cuff of her outfit in one shot, but has to fiddle with it for a lengthy period again in the next, since it was back on fully fastened. And then in the next shot she is casting aside...the left, and both are gone. (00:08:00)
Continuity mistake: Asking about the painting, Stephanie turns her head towards Emily. She turns back towards the painting when Emily mentions the East Village, but then in the next shot she is still facing Emily. (00:07:20)
Continuity mistake: Sean goes upstairs after botching Stephanie's name. Emily's glass suddenly reappears in her hand at the cut. (00:13:25)