Continuity mistake: At the end of the movie, when Rasputin is about to take away Liz's soul, the shot is over Rasputin's shoulder with Hellboy's front in view. We can see Rasputin's hand move from above Liz's chest to her jaw as he bends over. Then the shot changes to Rasputin's front. In this shot, the hand is back above Liz's chest and is moving to her jaw again.
Continuity mistake: When Kroenen slices the statue, the cut where the reliquary splits in half isn't close to any of his hits; his hits are toward the upper half of the statue.
Continuity mistake: In the scene where Hellboy and his group arrive at Graveyard 16, a shot from farther away shows the graveyard in the background and in the foreground are the 3 vehicles in which they drove up. The two smaller vehicle's roof, hood and windshield are already covered in what looks like about 1 cm of snow, although they just arrived. Such light and dry snow that appears to be falling in the scene would have been blown off the car while driving, and a layer that thick takes a lot longer to develop.
Continuity mistake: In the final scene between Hellboy and Liz, when he is telling her what he said to bring back her soul, the shots change several times between one of her face, and the back of Hellboy's head, and vice versa. Every time we see Liz's face, she is looking up into Hellboy's face, but when we see the back of her head on the interspersed shots, her head is not inclined upwards at all.
Continuity mistake: When Kronen cuts open the statue in the museum, he in only holding one of his swords. The guards come rushing in and Ilsa says, "get them." Kronen turns and is now holding both of his swords.
Continuity mistake: In the beginning, when you first see grown-up Hellboy, you can see his legs, and like the comic, the calves are skinny and he has hoofs rather than feet. Yet in every other scene his calves are much bulkier (big enough to fill his pants) and he has human feet which he wears large boots on.
Continuity mistake: Manning and Hellboy are in the tomb tunnels when Manning brushes the back of his hand against the blades in the walls, but later he shows the wound to Hellboy and this time it's on the tip of his finger,.
Continuity mistake: When Hellboy chases Sammael into the subway, in one shot, he's slightly leaning to his right. In the next shot, he's leaning to his left with no time to change. This has nothing to do with the camera angle.
Continuity mistake: When Hellboy throws the Nazi guy into the spike pit, a bunch of objects also go in as well. In several shots, they disappear or change position.
Continuity mistake: In the Sammael chamber, the room is a big area with barely anything around the centre. Then Liz tells Myers to run and suddenly there's a big rock for him to hide behind.
Continuity mistake: When Hellboy is captive at the end, he doesn't have the Professor's Christian necklace. A few shots later, he suddenly does.
Continuity mistake: When Hellboy is fighting the big tentacle thing, he falls and starts to get up. In the next shot, he starts to get up again.
Chosen answer: According to the comic books, his name is Anung Un Rama, or 'World Destroyer, The Great Beast.'