Factual error: During the battle in the throne room, a soldier is seen hiding behind a pillar. Then Telemachus comes and swings his sword clockwise. However, we see the soldier getting hit by the sword, hitting the pillar, and then falling to the ground. This only could have happened if Telemachus had swung his sword counter-clockwise.
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.
Tiresias: It is the journey itself that makes up your life.
Trivia: The makers placed an animatronic head over a sumo wrestler's body to create the cyclops.
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.