Continuity mistake: When the League are at Gray's home and the Phantom interrupts, he tells Quatermain to put the gun down. The gun starts falling pointed to the right but a close up shows it landing pointed to the left, but it never flipped. (00:24:00)
Continuity mistake: When The Phantom kicks Quatermain's gun along the floor we see the gun landing close to the wall. In fact the tip of the gun even sticks a bit in to a hole in the wall. When Quatermain a few seconds later picks the gun up the gun has moved at least a feet away from the wall. (00:24:40)
Continuity mistake: When Dorian is getting shot, the shooter's mask thing falls down. About two shots later it is back up, in the next shot it is down again. (00:26:45)
Continuity mistake: When the assassin takes Mina as hostage and holds a knife to her throat, Mina's scarf is under his arm. Two shots later the scarf is hanging over his hand. (00:27:50)
Continuity mistake: When Dorian Gray is shot with the machine gun, all the bullets are taken right in the gut, and the wounds are correctly shown in mirror-image when the back view of him is shown. However, the next shot of his front shows a couple of wounds in the shoulder, the biggest one being in his right shoulder at the very top, a wound which was not visible in the back view. (00:27:55)
Continuity mistake: When Mina bites the attacker at Dorian Gray's house for the first time there's blood all over her face, but after she bites him the second time it's gone before she had a chance to wipe it off (even that wouldn't have removed the blood so completely). (00:28:25)
Suggested correction: We don't see what she does when she's down though. Whilst you are correct you could be forgiven for believing that she may give word her face on his clothing.
Continuity mistake: When the members of the League are attacked at Dorian's home, the fight is accompanied throughout by a blizzard of paper falling from a height, yet hardly any of the books have been disturbed on their shelves. (00:28:40)
Continuity mistake: Mina's hair turns curly whenever she is in vampire mode EXCEPT when she is in Dorian's library and attacking the goon who held a knife to her throat. (00:29:20)
Suggested correction: Because she doesn't go "Vampire mode." She simply sucks his blood.
She's can't suck his blood without turning into a vampire. Her "vampire mode" includes having fangs used for sucking blood.
She is able to control her transformation. She's progeny of Dracula himself. She's extremely powerful.
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)
Visible crew/equipment: When Hyde is first brought aboard the Nautilus, he is loosely chained, but still tossing crewmen about. There is one crewman, whose back is toward the audience, whose striped shirt puckers around the harness as he is jerked backwards. (00:36:00)
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)
Other mistake: When Allan is teaching Sawyer to shoot, he says that he 'brought his son along' on a mission. However, the subtitles say 'son-in-law'. (00:44:35)
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)
Revealing mistake: In the bit where Mina is using her scientific equipment and Dorian gives her a drink, the blood is on her hand before she cuts herself. (00:47:55)
Factual error: In Venice, Quatermain hunts down M in a cemetery, only there is no cemetery in Venice. The burial ground is on the island of San Michele in the lagoon. (01:01:25)
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)
Revealing mistake: When the Nautilus' hull is breached by the explosives Gray has set, water rushes in with great force. The crewmen who get hit by the water do not get swept off their feet - as they should have - but instead keep on running. (01:07:10)
Plot hole: When the team plays back the record, it contains an extremely high-pitched tone which triggers the crystal sensors on the ship. But the speech on the record is low quality. This low quality would be the result of extreme frequencies being lost; but if they were, the trigger tone (a VERY extreme frequency) would be lost too. If the League's gramophones are capable of recording and playing such a tone, they should also be able to record and play back the speech without any quality loss. (01:09:05)