Troy: The Odyssey

The Kraken comes from Scandinavian rather than Greek myth, and legends of the Trojan War do not include a monster like this or a related curse. The god Poseidon did control a sea monster, though in certain legends he unleashed it against Troy, not the Greeks. There is a sea monster named Scylla who attacked Odysseus during his travels though, but it is left out of this film.

The boat Odysseus attempt to sail home to Ithaca on is laughably small. It is more of a dinghy he might use to take him to a waiting warship anchored offshore than a vessel that could conceivably survive the sea.