The song's got a strong foundation beneath: memorable melody, interesting lyrics, well-composed music, but the little nuances are what do it for me in this one. Sound effects that are pushed back in the mix to act as textures along with carefully-placed dissonances do a lot to give this song its intensity and expand on its basis. It's attention to detail like this that shows how much a musical group cares about and has vision for its art.
Got any favorite little details that you notice in songs?