||In Homefront/Paradise Lost, Odo could instantly tell that Admiral Leyton was a changeling. Here he takes a whole episode to work out that Martok is also a changeling.
Just how powerful are disruptors compared to phasers, anyway? In the mirror universe, mirror-Odo exploded when he was hit by a single phaser beam. But it takes a good several dozen disruptor blasts to kill this changeling!
O'Brien claims that a dead Changeling will revert to a gelatinous state. But he's only ever seen one Changeling die, in "The Adversary", and that one just crumbled into dust. The one we saw die in The Ship did the same thing.
At one point a Klingon claims to have killed a Benzite Captain, and Sisko mutters that he went to Academy with the man. This is impossible, since in TNG's "Coming of Age" we meet Mordock, the first Benzite ever to go to the Academy. So unless Sisko went to the Academy after Mordock did in 2364, it couldn't have happened. And with the Academy being a four year course, there's no way Sisko could have graduated in 2368 and been a senior officer during Wolf 359 in 2366.
Oddly, the Runabout in this episode is damaged in the exact same manner as the one in "Body Parts".
Why is there a statue of General Chang in the great hall? The man was a traitor the Empire who assisted in the assassination of his own Chancellor!
So you're a Changeling in a big room full of armed Klingons. You're impersonating the second-highest ranked Klingon present. Somebody accuses you of being a changeling. Do you... a) Yell that the accuser is a traitor, and they should kill him immediately! Because hey, maybe that will actually work, and then you're safe! Or b) make a run for it. Because there's an entire room of potentially hostile guns around you, so you don't want to be there when you can maybe escape, hide, and shift to resemble somebody else - setting the search for you back to square one. Or do you c) Immediately shapeshift in front of everyone and attack the accuser, giving everybody present 100% solid proof that you are indeed a Changeling, and presenting them with a nice easy target for their weapons. Well, if you're an idiot, you go with c!
Why didn't they bring Dax on this mission with them With her detailed knowledge of Klingon culture, she would surely have been a better choice than, say, O'Brien. (In reality, Terry Farrell has very sensitive skin. She is allergic to the makeup used for Klingons, and cannot spend more than a few minutes at a time in direct sunlight.)