Bastien Moreau (No. 20) - S6-E11
Other mistake: Ressler says, "Moreau paid Kruger for access," but Kruger didn't know Moreau's name. In the next episode, the team is surprised to hear that Moreau is involved. (00:34:40)

Starring: James Spader, Ryan Eggold, Diego Klattenhoff, Megan Boone
Bastien Moreau (No. 20) - S6-E11
Other mistake: Ressler says, "Moreau paid Kruger for access," but Kruger didn't know Moreau's name. In the next episode, the team is surprised to hear that Moreau is involved. (00:34:40)
Character mistake: As Reddington sets up the blood transfer between himself and Ressler he inserts the intravenous line in Ressler's arm first and then in his own arm. This way the remaining air inside the line gets into the recipient's body and could very well kill him. Judging the expert way he handles the set up he should know to first insert the IV in his own arm, let the line fill with blood and then insert the IV in Ressler's arm.
Suggested correction: That amount of air would probably not cause any problem. It actually takes quite a lot of air to cause any issue.
Trivia: Red's trademark fedora was James Spader's idea.
Question: At the beginning of the final segment, the American Flag is flying upside down outside the beach lodge. Since it is pretty clear that Red would not being trying to elicit support/backup for the deeds that he and his female accomplice were about to undertake, what is the significance of this widely accepted distress signal?