Continuity: Near the end of the movie, Katana and Blake are worrying about the possibility that MacLeod has spoken with Neyman and knows the exact coordinates of the hole in the shield. That's odd, because a few scenes before we see Katana and Blake monitoring MacLeod as he speaks with Neyman in the prison Max. There Neyman tells the coordinates. So they know he knows.
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At the beginning, when all the guys are running away from the explosions in the war, you see a guy getting thrown into the air, but the black kickplate that propels him into the air is clearly visible. See more...
Highlander II: The Quickening (1991)
Directed by Russell Mulcahy, starring Christopher Lambert, Michael Ironside, Sean Connery (add more)
Highlander II: The Quickening mistakes
Continuity: Everyone seems to enjoy swapping swords in this movie. MacCleod begins with the shortsword he takes from the porcupine headed guy, Ramirez takes a rapier from the Hamlet play, Katana has a huge broadsword. As the film progresses Ramirez suddenly acquires his original Japanese sword which MacCleod later has in spite of not pulling it from the ground where Ramirez puts it in the fan room, then MacCleod suddely goes back to having the shortsword and finally he has Ramirez's sword again, and Katana magically has the shortsword with his broadsword dissappearing completely.
Continuity: At the end of the film after Connor defeats Katana, he drops to the floor into a large puddle of water, but in the next shot from the side, he's no longer in any water.