I recall there being a fairly prominent article in the online edition of the Grauniad last week on how the organizers were training all and sundry not to "hang flags upside down" and on how not to play the wrong anthems.
Obviously, they forgot to teach them how to pick the right flags before hanging them upside down.
Perhaps, of course, the organizers were betting on the DPRK being no longer in existence when the Olympics were scheduled to kick off, so they left them out of the training manual.