I'm having a lot of difficulty stretching the answer over two paragraphs, so maybe you guys could help provide a new answer that I didn't think of before.
The subject of prejudice was not really an issue for the family when they first arrived as nobody really knew where Iran was at the time and incredible friendship was extended to the family because they were new and unfamiliar with American culture. However, the theme of prejudice underpins much of the latter part of the book as after the Iranian revolution the opinion of Iranians was low; after Iranian terrorists took Americans hostage the family felt more antagonism and although it is not a theme in the book that is constantly repeated, it is definitely underlying in the way in which the author throws in observations and off the cuff passages about the experience of feeling that unsaid prejudices were definitely bubbling under the surface in a number of situations.
