Plot hole: Several shots show Barnaby reviewing a newspaper announcing a new death in Strangler's Wood, the Brazilian Woman. No one supposedly knows who she is, as the article states, but the photo of the dead woman is a professional headshot from when she was alive. How could they have obtained her headshot if no one knows who she is?
Plot hole: During Ryder's report, as Bruce and company watch it on TV, the camera suddenly zooms in on Joker standing on a catwalk above Ryder, and none of the crew, especially not the camera man who caught the villain, makes a comment about this. They may have thought the Joker (or rather an impersonator) was perhaps a surprise gag in the show, but since this is supposed to be a serious documentary report, it is still strange that they wouldn't point it out.
Plot hole: When Mike Walker is out looking for his son Connor calls Satch and asks, "What's up with Mike?". She couldn't know that there was anything up with him, she left before he heard his son was missing. Had she called Walker on his cell, he would have explained what was going on, as he was very eager to tell her. Obviously a set-up so that Satch could tell her that the boy was missing.
Plot hole: A kidnapper who raised her victim hires Jimmy to tell the mother the girl is OK. Jimmy is subpoenaed to reveal the kidnapper, which he'd be allowed to do for an ongoing crime. He beats it by giving an impassioned speech about the sanctity of not violating attorney-client privilege under any circumstances. That's rich considering that in season 6 Jimmy violated a much more rock-solid privilege in the case regarding the boy who had a brain aneurysm. Yet no one ever brings up the prior incident.