Factual error: When Professor Broom puts the old pieces of paper together, the text translates to "Graveyard 16", not "Sebastian Plackba 16".
Factual error: During the subway fight, Hellboy rips a payphone off the wall, which sparks as he does so. A phone does not have a voltage source that would be high enough to spark.
Chosen answer: According to the comic books, his name is Anung Un Rama, or 'World Destroyer, The Great Beast.'