A supposed full list below of differences between Nolan's version and the original story. It seems that individuals are interpreting references of the film conforming to "modern morality" in their own personal contexts (Judean, Christian, etc), though "biblical" arguably subsumes most.
With regard to the missing "Nobody trick" (that Davidson also brought up), the Greek warriors didn't even know that the cyclops could speak and understand until virtually the end of that segment when they were fleeing, after its eye was stabbed and it beseeched Poseidon, its father, for vengeance against the crew.
The sound in this theater was severely unbalanced with respect to the dialogue (always lower than the other sounds and music). So even though "Zeus's Law" (fictitious term for xenia) may have been mentioned several times, I barely recall it (especially what it meant, the importance) along with a lot of other conversational gaps. Also didn't help that I never read much about the film or prepped beforehand, and Nolan's freaking non-linear approach right out of the gate added to the cognitive disorientation. Again, I get why so many felt like they would have to watch it a second time, later, in order to apprehend what Nolan was doing or be more confident of their appraisal of the movie.
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LIST CHANGES TO THE STORY
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Zeus's law plays a big role.
There are fewer appearances of gods [and they're largely psychological rather than external, like Athena].
Antinous and Sinon get new backstories.
Odysseus's parents are not included.
The Lotus Eaters and Calypso's stories are combined.
Odysseus doesn't do his "Nobody" trick.
The crew doesn't stop on Aeolia.
The Laestrygonians don't throw boulders.
Odysseus is a more faithful husband.
King Alcinous is skipped over.
Penelope doesn't test Odysseus with his bed.
The story ends with exile instead of Athena bringing peace.
Odysseus is traumatized by the war and tormented with guilt over the horse deception and the bloodshed during the fall of Troy.
EXCERPT: The biggest addition to The Odyssey is in the characterization of Odysseus. He's not only a formidable warrior and tactician, as he is in Homer's poem, but also a weary veteran grappling with guilt and the horrors of war. Yes, he's the brilliant mind who invented the Trojan Horse, but he's haunted by the destruction it wrought—innocent people murdered, homes burned, and a whole civilization destroyed. (This could explain why The Odyssey was Nolan's follow-up to Oppenheimer.)
"It's an academic twist on a story about homecoming, but [also] this character who, much like Oppenheimer, is wrestling with the price of his ingenuity and what it's going to mean for the world," Matt Damon told Letterboxd.
"The Trojan Horse, ingenious as it was, is a trick [that is in] direct violation of Zeus's law. It's presented as a gift and an offering of peace—but obviously, it's full of soldiers. Of course, knowing that the world was cast into four centuries of darkness right after this story takes place—there's a lot there thematically, and [you] can draw comparisons and lines from there."
In fact, it's because he's still processing that trauma that Damon's Odysseus seems to avoid going home—it's not just that gods and monsters kept him off course. When he and his men first leave Troy, he takes a different route than Agamemnon so they can "see the world" and take the scenic route. It's an erratic decision from someone who's in denial of their inner turmoil. As Odysseus (in disguise) later tells Penelope, he regrets that he and his men "abused what's sacred between people" when they attacked Troy. Athena (Zendaya) even appears to him in the form of a Trojan woman he watched get murdered.
These details add more depth and complexity to one of the most famous and glorified heroes in history. This version of Odysseus challenges—or expands upon—the definition of masculinity. That's not to say that Odysseus wasn't emotional in Homer's poem; he also wept often, felt great pain, and was clearly flawed. But Nolan's telling looks at his greatest achievement through a new lens. It's also inspired by the opening line of Emily Wilson's 2017 translation of The Odyssey, which Nolan himself cited as an influence: "Tell me about a complicated man."
"Zeus's law" is mentioned by many characters in the film as the sacred rule of hospitality. All people have an obligation to welcome guests and treat them with respect, and guests must do the same for their hosts. "It's the Golden Rule—treat as you would be treated—and with a theological underpinning in their world, that you might be a god in disguise," Nolan told
The New York Times.
In actual ancient Greece, there was no actual Zeus's law, but there was a concept known as "xenia" that was still connected to the god of thunder. The term comes from Zeus Xenios, "the aspect of Zeus that cares about…hospitality and host-guest relationships," Suzanne Lye, a professor in the department of classics at the University of North Carolina at Chapel Hill, told ELLE. It was necessary for survival in antiquity, when it was far more dangerous to travel. It's not exactly the Golden Rule, but Nolan expanded its meaning for his adaptation.
Xenia is a recurring theme in Homer's Odyssey. That's why Penelope and Telemachus can't just kick the suitors out of their home. Eumaeus and King Alcinous are examples of hosts who honor xenia. Penelope's suitors, on the other hand, violate xenia as they take advantage of Odysseus's home. Circe also defies it by luring men with food and turning them into pigs.
Nolan uses that concept to bring out the irony of the Trojan Horse. It's considered a genius war tactic but also violates xenia—because the Greeks disguised themselves as a harmless gift and then killed their hosts. When Odysseus realizes what they had done, it haunts him throughout his journey home.