Continuity: Hellboy tosses Dr. Manning through the quickly-closing door to escape the pendulum on the bridge - he barely makes it under. Hellboy then spends thirty seconds dodging the pendulum, but when he dives for the door it's still closing at the same point and speed - just enough for him to pass.

Continuity: When Hellboy is walking at one point, holding his gun up in his left, gloved hand (just after one of the agents has said "This place is like swiss cheese"), watch the frame. It switches suddenly so his right hand (the stone one) is his left, and he's holding the gun in his "right."

Continuity: Hellboy's oversized "Samaritan" revolver is shown to only hold 4 rounds. Yet he fires at least 6 without stopping to reload during his fight with the first Sammael creature in the museum.

Continuity: In director's cut dvd edition, toward the end of the movie, when Hellboy hits Kroenen in a head, and says, "You killed my father, your ass is mine," Kroenen's left side of a mask changes from being damaged to intact, than damaged again from different angles.

Continuity: In the scene where we see Professor Broom talking to Jack about Abe's origins, we see the professor pick up some rotten eggs from an open bowl and place them into a tube. It's here that Jack reacts to the bad smell from the eggs but surely if they have been sitting out in the open the smell should've been more noticeable sooner?

Factual error: When Professor Broom puts the old pieces of paper together, the text translates to "Graveyard 16", not "Sebastian Plackba 16". Submitted by Grigory the Wanderer

Continuity: 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: 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.

Revealing: When Hellboy is filing down his horns with the small razor/sander contraption, you can tell the small sparks coming off are not coming from the contact of his horns and the sander, but rather are coming right out of the sander, revealing it is a prop.

Continuity: When Ilsa pours the contents of the flask from the statue on the floor of the museum, not all of its contents are emptied. In the next shot, she's seen standing in the background with the flask completely empty.

Continuity: At the end when Hellboy is carrying Liz off the alter she hasn't got a top on. Later after Hellboy kills the behemoth she has got a top on.

Continuity: When Professor Broom is feeding that thing in the tank rotten eggs, you see him pick up one egg and put it in the tube. When he pushes the tube up in the next shot, you see more than one egg in the tube.

Deliberate "mistake": We've established that Hellboy can bleed when he gets cut by Kronen and when Sammael plants the eggs in his arm. We've also established that Kronen's swords are extremely sharp by the way he cuts through a statue with one swipe. But in the fight with Kronen in Rasputin's crypt, Hellboy grabs both swords with his non-stone hand and Kronen cannot free them. And later, in close-ups, there are no cuts on Hellboy's "normal" hand. Submitted by Mark Bernhard

Other: All the time that Abe has been underwater reading five books at a time, he's never designed a machine to turn the pages? Even a pointer on a long arm would work serviceably.

Continuity: After Liz arrives at BPRD, Myers gives Hellboy chili and tells him that nachos are on the way. A dark cat is walking up to Hellboy's left side on the bed. In the next shot, the cat in that place is black-and-white and facing away from the camera.

Continuity: After Hellboy falls on the dumpster and sees Rasputin walking toward him, there is a smear of blood on HB's lower lip. It cuts away for a second to show him pick up his gun, and when you see Hellboy again, the blood is gone. Submitted by Mark Bernhard

Continuity: 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: Kroenen kills the two museum guards on the balcony and they flip as they fall. The shot on Kroenen shows both landing facing up (use slowmo to see ties) and they bounce with their toes pointing up. In the next shot showing Kroenen and the other guards, the dead guards are facing down.

Continuity: On their date Myers tells Liz that Hellboy loves her. She looks up into his face, but in the next shot she's looking down again.

Continuity: In the truck on the way to the library, Abe rises and says, "Outside...with her," and gestures. In the next shot, he's hunched over.