Deliberate mistake: The same shot of Odysseus killing a man with two swings of his sword is used twice in the battle scene.
Deliberate mistake: When Penelope gives birth to Telemachus it is obviously not a newborn baby.
Continuity mistake: When Telemachus is born and Penelope and Odysseus hold him, Penelope's hand goes from touching the baby's arm to touching his head.
Trivia: The makers placed an animatronic head over a sumo wrestler's body to create the cyclops.
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Answer: The Trojan War itself was a decade long, followed by Odysseus' ten-year journey home to Ithaca, so all told he was gone roughly twenty years.