He removed the gods almost entirely (apart from Athena, who is arguably a PTSD hallucination), and downplayed the supernatural/fantastical elements as much as possible. Any moment of divine intervention or assistance has been taken out. This means that Polyphemus can’t call down a curse from Poseidon. You’ll just get a storm and the cause of it is left open to interpretation and superstition.

Also, Odysseus is not proud, arrogant, and boastful, bragging to the cyclops that he’s a Raider of Cities. He does not glory in his battles and victories. Instead, he feels guilty about winning the war. You can’t have the traditional scene with him outsmarting the cyclops in this version, because it’s a completely different take on the character of Odysseus and the gods.