Continuity mistake: Mia's hand is resting on her pillow and instantly changes positions between shots as she speaks with Allen.
Revealing mistake: It is obvious the film was reversed when the plant takes over the old lady's body - given away by the unnatural direction and movement of her hair.
Answer: The blonde girl with bangs in the intro does not appear to be a Jerry Uelsmann model, whose still photographs were used to set the theme of the intro. Although the "Intro Girl" clips are in the Uelsmann style, they are video motion clips. The end credits identify a video production company responsible for creating the introduction, but they seem to be out of business. My best guess is that she is a local model hired by that company to shoot the intro.