As long as humans have gathered together, they have told stories.
One of the archetypes of storytelling is that of the lost soul, struggling to find his or her way home.
He told the three men that they will not find the treasure they seek.
The prophet in the Odyssey was Teiresias, who Odysseus talked to when needing insight on how to get home.
The example in question, the Coen Brothers’ movie, demonstrates that it is appropriate and proper for filmmakers to adapt, rather than copy, the literary work.
Direct Digital Sythesis - O Brother Where Art Thou And The Odyssey Comparison Essay
While there are elements of storytelling that transcend the medium, there are many that do not, and therefore each medium must stand on its own merits.
I also think the role of the blind prophet might be a symbolization of Athena, and how she took another form to disguise herself, but yet help lead Odysseus in the correct direction.
Observing the characters, one could easily assume that George Clooney's character, Ulysses Everett Mc Gill, seems to be the representation of Odysseus, on a journey to return home to his wife, whom is at risk of remarrying.
Both versions show the protagonist struggling to reach home in order to save his family.
Both allow for supernatural elements to oppose, or at times to support, the hero on his journey.