Audio problem: At the beginning, when Professor Broom and the young Hellboy are spending Christmas Eve at a military base in New Mexico, Broom insists that Hellboy go to bed, while Hellboy insists that Broom first tell a bedtime story: "Just one, and then I'll go to bed right away, I promise!" Which is an overdub (one of several in this scene). More than once, the young Hellboy's mouth visibly says something very different than is heard in the audio.
Hellboy II: The Golden Army (2008)
1 audio problem - chronological order
Directed by: Guillermo del Toro
Starring: Ron Perlman, Jeffrey Tambor, Selma Blair, Luke Goss, Doug Jones, John Alexander
Continuity mistake: After the golden army bots awaken, it zooms out to show how big the army is, when they do the prince and princess disappear in the background, then reappear.
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Suggested correction: There are two black silhouettes on the background, they should not be black, but still.
More trivia for Hellboy II: The Golden Army
Question: When Abe or the Princess are in the library, (but I can't remember if they are together) what is the name/author of the poem they are reading?
Answer: "In Memoriam" by Alfred Lord Tennyson.