Continuity Issues.
I could be wrong since no one else started a topic thread on this. The final episode revealed that when young "Martin Odum" left his "English secondary school," it was actually a Soviet covert double agent training camp and at the time "Martin Odum" knew he was actually a Russian covert agent.If that is so ,it doesn't explain how "Martin Odum" would think he could get away with leaving his Russian covert mission and live with his young "Irish wife,"(Nina Brenner) happily ever after somewhere in England? Continuity problem number two in one of the early flashbacks
Curtis Ballard was surprised to learn that Gabi Laska married that corrupt police official. In an even earlier flashback in the series finale , Gabi told Ballard she was marrying that corrupt police official Kristof Blazek ( I rewatched the episode) because he fathered her baby.So how could Ballard be surprised when Ballard later learns she married the corrupt police official?I could be wrong on my observations.
That's just my two cents.