Deliberate mistake: Elliot threatens Olivia about her testing positive for Oxycontin because she drank a peppermint mocha he brought her. If she tests positive she loses custody of her child. The thing with Oxy is that it's in one's system for a maximum of 4 days. Could be even less if only a small amount was taken and somebody exercises and drinks lots of water. Somebody could also eat poppyseeds and that would give a false positive. She could say she ate a poppyseed bagel. (00:14:00 - 00:16:00)
Continuity mistake: When Angela's hookup leaves her on the balcony she has almost finished her cigarette, but when the camera switches back to her a few moments later (she turns around after the door has just been closed), she has an almost full cigarette once again. (00:02:25)
Elliot: We're all living in each other's paranoia.