An overall message of both Ambrose Bierce's short story, and Robert Enrico's film version of "An Occurrence at Owl Creek Bridge," is to show the gruesome ending to ignoring a warning. Peyton Farquhar doesn’t listen to the sign posted saying that he'll be hanged , and goes to the bridge anyway. Bierce's short story does a better job of conveying the message because the scout tells him about the bridge and Farquhar goes to blow it up.
Peyton Farquhar is the most important character because he's the one who initially goes to the bridge, has the dream, and eventually gets hanged. Being more dramatic, the actor's actions were more unusual in the film, yet it may have been necessary because there was no dialogue.
To be accurate,