The whole movie is based around Julie (the living dead). Even though the first two movies of this series had an appriciated style, this movie comes and smashes everything. If it did not turn around this lethal woman, this movie would be a disaster
Julie, at first, shows only small signs of the disease. However, the more she changes, the more agressive she becomes. Then, she realizes that the only way to quench her thirst for brains is to mutilate herself. This idea is not only new to the series but also enhances the gothic side of the movie.
Also, when we think we have reached the end of the movie, we are treated to a little surprise... somewhat like a double conclusion.