Continuity mistake: During the start of the battle in Odysseus's throne room at the end of the film, watch as the evil suitor hurls an axe at Odysseus and Telemachus, shouting "A river of blood!" Both duck as the axe flies towards them. Then in the very next shot, they duck a second time as the axe smashes into the wooden throne behind.
Continuity mistake: As the sailors cut open the sack of winds, between shots the knife they use moves further up the sack.
Continuity mistake: The blood on the cyclops' chin disappears quite suddenly, though he never wipes it off.