Plot hole: Ham Tyler doesn't recognise Kyle Bates even though he met him in the internment camp in episode 3. Ham also makes exactly the same remark about Nathan Bates in both episodes. (00:10:30)
V: The Final Battle: Part 2 (2 Hrs) - S1-E4
Plot hole: During the raid on the pumping station, Elias overpowers a Visitor guard and throws him off the catwalk - into a hall full of workers, engineers, and even more guards. Strange that no one notices.
Dreadnaught - S2-E2
Plot hole: At the press conference Ham Tyler positions himself only a few feet in front of about half a dozen security guards, yet not one of them notices him, even when he starts shooting. (00:35:45)
Plot hole: In the opening scene we see Mike and Kyle driving in the truck. Kyle remarks that Mike has been driving since midnight and it is broad daylight outside. So they have supposedly been driving for several hours. Yet they start talking about their mission as if they have only just got in to the truck. As anyone who has been in that kind of situation knows, everyone always discusses the important stuff at the start of the journey, so it is clear that the scene has been poorly scripted. (00:02:00)