What are the themes, symbols, and literary devices in "A Rose for Emily"?

This question is asking about several things, so I would like to focus on themes. One theme of this story that I feel can't be ignored is the theme of death and/or mortality. Death hangs over this story right from the very beginning because readers are told in the first sentence about Emily's death.

When Miss Emily Grierson died, our whole town went to her funeral: the men through a sort of respectful affection for a fallen monument, the women mostly out of curiosity to see the inside of her house, which no one save an old man-servant—a combined gardener and cook—had seen in at least ten years.

The story then moves forward and backward in time as fluidly as a person's actual memory might flow through various memories, but we do see that Emily has a unique relationship with death. Corpses don't bother her, and we first see that when she refuses to have her father's body taken out of the house.
I think another strong theme of the story is the theme of isolation. The town viewed Miss Emily as a bit of an oddity all throughout her life, and that served to isolate her in many ways; however, Miss Emily kept herself separate, too. She didn't make efforts to connect with others as she was, and her isolation increased as she got older. Again, the first paragraph is a source of solid evidence of this theme.

. . . the women mostly out of curiosity to see the inside of her house, which no one save an old man-servant—a combined gardener and cook—had seen in at least ten years.

A prominent theme in William Faulkner's 1930 story is that the traditions of the South were disappearing as modernity encroached. This is seen in the situation in which the new tax collector refuses to honor the gentleman's agreement for tax exemption that Emily Grierson's father had enjoyed.
Symbolic elements that support this theme include the letter Emily Grierson sends to town officials in "flowing calligraphy in faded ink," in which she studiously ignores the request for tax remittance. When town officials come to call, her home is filled with dust and cracked furniture; she employs Tobe, "the Negro," and Miss Emily wears clothing from another age. Miss Emily, her home, and her servant are all relics of the antebellum and postbellum South and have as little to do with modern life as the china-painting classes she once taught.
A literary device that Faulkner employs is seen in the way he organizes the narrative. The story begins in the recent past and works backward to a time when Emily was a younger woman, until the final section, in which the narrator returns to the outer story frame of his more recent reminiscence. Moreover, much of the action of this story related in past tense is conveyed through dialogue; some of it is between Emily and others, while some is dialogue about her. The narrator uses "we" as his point of view.