When Clay begins story 12 he takes the tape from his backpack and puts it in the walkman. He had been listening to story 11, he would only have to flip the tape over.
When "Meth" Seth is confronting Justin about the subpoena and choking him, in some angles, Justin's left arm is free, pushing on Seth's right shoulder. In other angles, it's pinned under Seth's right arm.
When Justine is in Jessica's bedroom, and he's telling her about how Bryce helped him during his life, when Jessica has her back to her bedroom door, in one shot, the door is almost closed with about an inch and half gap, and in another shot, the door is closed.
In the ambulance scene, the EMT says his patient has "a heart rate of 120," but in the background, you can see another EMT doing CPR on the patient. CPR is only done on pulseless patients.
Bank bags are only used for night deposits.
After Hannah puts the deposit bag on top of her car to look at her phone and make a call, you can see the tape holding her wig in place on her right temple.
When Clay's mother is telling him about his upcoming subpoena, the kitchen counter behind them has a few standard kitchen items (toaster oven, bottle of oil). In the shot where Clay says he's going to get the door, a computer monitor suddenly appears on the counter.