Continuity mistake: When Park Eun-hee is talking into a video camera there are some on-screen icons for the camera: zoom, battery level, etc. Initially there are two guide lines on the zoom level bar. When the view changes then switches back a few seconds later, there is only one guide line.
Episode #1.9 - S1-E9
Continuity mistake: Look at Alicent's hands when Lord Beesbury starts to object to the plan to usurp the throne from Rhaenyra. In the initial shot, her hands are on the table but not in the next. (00:06:40)
Visible crew/equipment: At Goody's, while Stan is on the phone with Francine she tells him to turn around, and there's an actor's mark taped to the floor at Francine's feet. (00:39:30)