Louis T. Steinhil (No. 27) - S7-E1
Factual error: In the beginning a woman is counting brown 200 Euro banknotes. 200 Euro notes are yellow.

Starring: James Spader, Ryan Eggold, Diego Klattenhoff, Megan Boone
Louis T. Steinhil (No. 27) - S7-E1
Factual error: In the beginning a woman is counting brown 200 Euro banknotes. 200 Euro notes are yellow.
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?