When the Lethean attacks Kor, as he removes his hands from Kor's head the Klingon cranial prosthetic moves, shifting position on the actor's forehead.
When Dax helps Kor up off the floor in his quarters, directional blocking tape can be seen on the floor in the shape of a T.
When Kor is hanging from the ledge in the cavern, the stunt double is noticeably slimmer than actor John Colicos.
When Kor is hanging from the ledge in the cavern, the steel handle of the Sword of Kahless can be seen flexing in his grip.
During their lengthy journey to the surface, Jadzia mentions several times that they need to stop the bleeding on Worf's shoulder wound, and even has to change his bandage. A directed energy weapon, such as the phasers that she and Worf are both wearing at their waists, could be used to cauterize the wound.
After finding the sword, when Kor is arguing with Worf over who is responsible for Duras discovering their plan. Kor uses the excuse that his thoughts were stolen by a Lethean. There is no indication that Kor was even aware that had occurred. Immediately after having his thoughts stolen, when he was awoken in his quarters, he showed no recollection of those events.
It's possible he did know but kept it quiet until that moment, but that's not in keeping with his character and Klingon honor.
It's possible he did know but kept it quiet until that moment, but that's not in keeping with his character and Klingon honor.
Jadzia states that whoever ransacked the hidden chamber "took everything." Numerous artifacts can still be seen, including the broken pottery that she is looking at when she makes that declaration.