Continuity mistake: When the team sees the Nautilus for the first time, rising from the Thames, the water around it is churned into large waves. But in the shots looking down on the team on the dock, you can see that the water is calm and still. (00:32:50)
Continuity mistake: When Quatermain realizes that Skinner is in his room (on the Nautilus), he puts out the lamp and the room goes black. We hear a scuffle and then the door opens and lights the room and we see Quatermain throwing the invisible Skinner out the door. But when Quatermain shuts the door, the room does not go dark again. (00:39:50)
Continuity mistake: In the scene on deck of the Nautilus where Quatermain and Sawyer practice shooting the target balls are lying in a row next to the railing, first five, then four, but before the last shot, four again, although another target has been catapulted into the water. (00:42:20)
Continuity mistake: When Quatermain hands the rifle to Tom Sawyer, both hammers are down, yet without cocking either of the hammers Tom fires two shots. (00:46:10)
Continuity mistake: When Mina tries to see what is the composition of the powder found on the deck, the amount of liquid in the test tube changes between shots. (00:47:55)
Continuity mistake: When Mina stabs Dorian Gray the last time, the sword does not come out of his back. After she stabs him and Dorian turns around as Mina is pushing him toward the wall, you can see that she put nearly the entire length of the sword through his body right below his heart, yet nothing shows out the back side. (01:03:00)
Continuity mistake: When Gray stabs Mina and pulls the sword out of her body the blade is clean, only in close-up when he wipes it there are blood stains. (01:28:00)
Suggested correction: The stains are only at the top end of the blade. We don't see the blood because the part is embedded in her.
Continuity mistake: At the very end of the movie, Tom Sawyer works the lever action on his Winchester rifle before laying it on Quatermain's grave. On this type of firearm working the lever-action cocks the hammer, but a moment later we see a close up of the grave and the hammer is down. (01:41:40 - 01:42:30)
Continuity mistake: When the Phantom's men ambush the League at Dorian's residence Sawyer is seen joining them in revealing themselves and aiming at the League (you can tell it's Sawyer by his clothing and weapon). Then during the Phantoms speech Sawyer reveals himself again as if he was never there.
Continuity mistake: When the men attack Quatermain in Africa, at one point he hits one guy with a bottle. The bottle completely shatters and there's nothing left to hold. When it cuts back to Quartermain, he's holding a big piece of a broken bottle.
Suggested correction: You can see the bottle in his hand in the scene where it shatters.
No, you can't. The bottle completely shatters. Then in the next cut he's holding the bottle.
Continuity mistake: From the meeting with M to Dorian Grey's place, the amount of makeup showing Skinner's head varies too quickly to be real.
Continuity mistake: During the brawl in Kenya at the beginning of the film, one of the goons is seen throwing knives at Alan which seem to pin him to the wooden pillar; yet in in a previous shot just before Alan slams the table onto one of the goons, the knives are already embedded in the pillar.