Deliberate "mistake": When Selene was painting on the wall of the prison, when she was a young child the painting was at her eye height. Now when she returns, the painting (although faded by time) is again at eye height but now she is an adult. The painting should be under the water, but would serve no purpose there since the audience could not see it.

Continuity: When Michael is being shot by the police, Selene can hear the shots very clearly, despite being down in the basement off the safe house. She goes out and goes towards the shots. Although she's much closer to the action, and outside the building now, the shots seem a lot further away.

Continuity: When Selene fights with the local cops in the forest, she gets shot in the gut with a shotgun and yet for the rest of the movie, she doesn't have bullet holes in the gut region of her clothes.

Continuity: In the scene where the helicopter is outside the castle, the entry team dons their diving gear to enter the water. They put on gas masks with one viewing panel. When the shot changes to a water view the entry team is wearing scuba masks, which have their viewing panel divided in half by a black line. When the team emerges from the water within the castle in the next shot they are back to wearing masks with one window.

Revealing: When Selene falls into the tunnels of Tanis's lair where the lycans are, you can see the pad she lands on. It's almost passed off as falling snow, but watch how as she lands the 'ground' squeezes like a pillow. This was pointed out in the director's commentary.

Other: When the glass in the Range Rover gets broken, the front window and passenger window shatters as normal automotive safety glass should. However, the driver's side glass gets broken into large jagged shards, instead of smaller pieces as would happen with any kind of auto safety glass, whether tempered, coated, or laminated.

Revealing: As Selene and Michael infiltrate Tanis's lair of exile, Selene kills both of Tanis's vampire girlfriends. Afterwards, as Tanis is carrying one of the dead girls' body to a dungeon we can plainly see the girl's arm holding onto his shoulders/back of his neck. If she was dead, her arm should have simply hung somewhere - not draped around his shoulders, obviously holding on like she is.

Revealing: During the final battle with William, Selene throws 2 explosives into the roof. The resulting explosion sends debris hurling towards the ground and the water, the rocks however float in the water.

Visible crew/equipment: At the end of the truck chase scene, when Marcus is rolling on the ground after being smashed into the cliff, you can see the white of his safety harness. This was pointed out on the director commentary.

Continuity: After the fight on the barge between Michael and Marcus, Selene tries to revive the impaled and seemingly dead Michael. At one point she rips his shirt open to pour her own blood into his wound, then the shot changes to her face, then changes again, slightly further out. It is in this shot, you can see Michael's shirt is still intact.

Continuity: In the scene where Michael was served food, the knife and fork are on his right side but on the next shot the fork suddenly jumps to his left hand.

Deliberate "mistake": When Marcus attacks the Truck, all the windows get smashed. Michael climbs back in and starts a conversation with Selene. There seems to be hardly any wind, although they're driving at quite a speed without a front window. They both have long hair, it should move.

Deliberate "mistake": When Selene and Michael are driving a truck, chased by Marcus, at one point in the chase Marcus flies directly ahead of the truck and stays upright in the air with wings outstretched, facing the truck. Given that the truck is travelling at high speed and Marcus is using wings for flying, it is just not possible. It can't be attributed to Marcus' inertia - he stays in front of the truck for a couple of seconds, long enough to lose any speed advantage he had before.