It's not really all that superficial. There is an entire industry devoted to hair in film; it's part of an Oscar category called "best makeup." In big budget movies, hairstyle is as important to character design as costume. If he was dressed in a bunny suit for most of the movie, would that be a superficial complaint, too?
You can't include a hairstyle like that without having it explained in the film, actually, because it's fucking ridiculous.