Audio problem: The exact same sound of someone yelling "Bring the grain" or "Where would you like these sacks of grain?" can repeatedly be heard inside the Ithacan palace throughout the movie.
Continuity mistake: The blood on the cyclops' chin disappears quite suddenly, though he never wipes it off.
Continuity mistake: When Telemachus is in the dark trying to string his bow, a vase with arrows in it is visible next to him. Then after he throws his bow to the ground in frustration, the arrows are gone.
Revealing mistake: Achilles takes the spear that he later throws at Hector out of a dead person's body, but the spear has no blood on it at all.
Visible crew/equipment: During the battle scene, Odysseus' narration goes "and no one knew whose side the gods were on." In the shot where he begins to say "were on," a crew member with brown hair and a black shirt is visible behind the charging Greek army. A split second later another crew member is visible, this time with black hair and a blue shirt.
Continuity mistake: Between shots of Menelaus saying "You, Telemachus, you must return", his arm magically appears on Telemachus' shoulder.