How is irony depicted in Flannery O'Connor's "A Good Man is Hard to Find"?

There is irony through the story. Irony occurs with the grandmother's assurance that she does not want to go to Florida where the misfit is heading. "I wouldn’t take my children in any direction with a criminal like that a loose in”. Another irony is Grandmother's insistence to see an old house in the wrong state which leads the family to the killers.