Schizophrenia : Can people have haullcinations if they have never been exposed to the experience to which the hallucination blends itself to?

I had just finished watching “A Beautiful Mind” and this question popped into my head. The main character sees people throughout the movie who are figments of his mind. One of the characters is a well read literary type. Now the main character created this “book person”. How could he have made this person without having read the material to which he imagined the person to be well read at?