Plot hole: If the Lady of the Lake walks every night to her room and kills those in her path, why didn't Flora and Miles' parents die in their room by the hands of the Lady in the Lake when they first moved in?
Clouds on the Horizon - S2-E20
Plot hole: Gus casts an illusion spell on the entire group to make them look like Coven Scouts. When he deactivates the spell, everyone goes back to normal, except for King. (00:16:40)
Plot hole: Some part of the dialogue between Jean-Luc Picard and Admiral Kirsten Clancy must have been left on the editing room floor, because when Commodore Oh refers to the conversation the two had, says that "He referred to Zhat Vash by name." He did not. (00:21:30 - 00:37:30)
Plot hole: The police are looking for school shooters who wore unicorn masks. There are cell phone recordings of the individuals shooting and I believe CCTV recordings from inside the school. There is a forensic science technique of accurately estimating suspect(s) height(s) using CCTV/camera recordings and math to determine the height. The police could have further narrowed down their pool of suspects by using this forensic method, but they are going at the students blindly chasing dumb leads.