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Trivia: If you look closely, during the song "21st Century Cure", several of the gravestones feature names of the producers.

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Deliberate mistake: Several times, you see an exterior shot of Nathan's house, and it is very clear that it is the same shot being used over and over, sometimes reversed.

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Continuity mistake: During the song "Night Surgeon", when Pavvi says: "He'll paint your ass like a Rembrandt", Luigi's face changes from looking at Pavvi to looking at Nathan between cuts.

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Deliberate mistake: If you look closely, you can tell the shot of Shilo riding the elevator to the top of GeneCo tower is the same shot from the beginning of the movie (when Rotti rides the elevator down to the ground), only reversed. The distinct camera angle and movement gives it away.

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Audio problem: Right before the end credits, as Grave Robber says "But Genco may survive if it undergoes surgery", right as Grave Robber says the word "may", his lips briefly don't match what is being said. (Confirmed in DVD commentary.).

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Deliberate mistake: When young Becca picks up the drawing that young Seth made, in the first shot, as she flips it over to look at it, you can faintly see the pen-marks through the paper, and they are not the same as in the following close-up shot, when we see the actual drawing. In the first shot, they seem to be a grouping of rectangular shapes, whereas in the second shot, it is obviously a large drawing of a penis. They had to use different pictures due to child labor laws that wouldn't permit the young actress from seeing the actual picture, and so a hand-double was used for the close-up shot. (00:17:15)

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Trivia: Whenever we see any of Seth drawing the phallic pictures in the flashback, the hands we see drawing in closeups are actually the hands of a small-proportioned woman, because child labor laws wouldn't permit the child-actors to see or draw the pictures. The same holds true for the over-the-shoulder closeup of young Becca looking at the picture.

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Trivia: Actor Christopher Mintz-Plasse was only 17 during the filming of the movie, creating some problems with shooting due to child labor laws. During pre-production, he was not allowed to see certain props or items from the film (such as Seth's phallic drawings), and his sex-scene had to be very carefully monitored and edited, as certain "actions" (such as too much skin, certain types of movements or positions, etc.) would violate the law.

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Continuity mistake: When Beer-Guy gets vomited on by the creature, there are no maggots or bugs on him, only green goo. Yet, seconds later, when he is washing himself off, there are maggots all over his hair and face.

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Plot hole: If the creatures are strong enough to simply burst through the walls, as shown at the end of the film, then the creature upstairs should not have been stopped by the small door that Bozo, the bartender and heroine shut on it to stop it. It was one of the larger creatures as well, so it could have easily gotten through.

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Continuity mistake: When Tuffy's son is killed, you see his shoe fly by the camera, with his severed foot still inside. Shortly after, when you see the shoe again, it is empty, and simply covered in blood.

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Trivia: Long time friend of Sam Raimi, and star of his "Evil Dead" trilogy, Bruce Campbell was approached for a role in this film, but had to turn it down due to a time conflict with his television show "Burn Notice."

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Trivia: Sam Raimi's brother Ted Raimi has a brief cameo as the doctor who speaks with Justin Long in the hallway after the initial first attacks. You never see his face, but you see him from behind and hear his voice. Ted has appeared in numerous Sam Raimi films, including the "Spider-Man" trilogy.

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Revealing mistake: When Arthur chops off the Black Knight's first arm, you can see his blade does not slice through the arm, but rather just bumps into the arm, which proceeds to fall off, revealing a fake prop-arm was used.

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The Gang Gets Held Hostage - S3-E4

Revealing mistake: When Liam is stabbed in the arm, as he turns around to walk away, you can see the outline of his real arm wrapped behind his back, under his robe for about one full second, revealing that the arm he was stabbed in was a fake prop-arm.

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Charlie Goes America All Over Everybody's Ass - S2-E9

Audio problem: When the Vietnamese man is playing Russian Roulette in the end, a few seconds after picking up the gun, he moves his thumb and we hear the gun cock. However, you can see that he didn't actually cock the gun, as his thumb never came into contact with the hammer while moving, hence the sound was a phantom sound.

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Trivia: In the English dub of the film, Anna Paquin voices Ray Steam, Alfred Molina voices Edward (Ray's father) and Patrick Stewart voices Lloyd (Ray's grandfather). The three also share another connection in real-life. Paquin and Stewart co-starred in all three "X-Men" films, which were created by Marvel, and Molina starred in another popular Marvel comic-turned-film, when he appeared as the villain in "Spider-Man 2."

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Revealing mistake: When Mad Dog sees the Dragon Emperor walking through the snow shortly after Rick and Evie leave, we see him rub some fog off of the window he is looking through, and it is very clear that the fog is computer generated. It doesn't disappear "correctly" as he wipes it away.

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Revealing mistake: Just before the final battle, as the O'Connells are preparing, you see Rick and Evie emerge from behind a rock with guns in hand and cautiously watch over what is happening. In this shot, Evie is holding two pistols, and you can see that one of the pistols (should be on the viewer's right) has a bent barrel, revealing it to be a prop of some sort.

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Trivia: A post-credit sequence in this film hints at a third "Hellboy: Animated" film that would feature a popular character from the comics named "Lobster Johnson." However, the studios were not pleased with the DVD sales for the first two "Hellboy Animated" films, and all production on the third has been put on hold.

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