If you are talking about the following five lines:
Two roads diverged in a yellow wood,And sorry I could not travel bothAnd be one traveler, long I stoodAnd looked down one as far as I couldTo where it bent in the undergrowth;"
Then we can say that the writer remembers being in a yellow wood at fork in the trail. While you read this part you can see that the path is probably away from normal modes of transportation. He suggests in the poem that he will not likely come this way again, further backing the idea this is not a familiar place. The place called "Yellow wood" is named by the idea of <span>fall with the leaves having turned colors away from green.</span>
The facts that are told at the end of the story are in sharp contrast to those that unleash the tragedy that Desiree and her son have to live. Only in the last few lines we discover that her husband knows the true cause of the dark color of the child's skin, which derives from the color of his own mother and has nothing to do with the unknown facts that cover the real origin of Desiree, since his filiation was not known from the beggining.
The irony is graphed in the fact that Desiree's husband could not have ignored that his mother was a dark-skinned woman, as he lived with her for the first eight years of his life and in addition to that, in the end, we also got to know that he was in possession of that letter that informed him the truth, in the probably event that he had forgotten it over the years.
The mistreatment he gave to his slaves was then the most important contradiction, although we can observe that his character softens after the birth of his son, even so having to see him daily was probably a permanent reminder of a shame he was trying to leave behind.
Explanation:
For example, Roderick says "I must perish in this bounden slave" (Poe, pg9) foreshadows that Roderick will die. Poe also foreshadows Madeline's death because she has a cataleptical disease that makes her sleep for long periods. This is an example because they can't really tell if she dead or just sleeping.