One main conflict is between Granny and the white filmmakers, which represents the broader conflict of race. The filmmakers see Granny and her home and family as representative of rural, poor black families, and they are wanting to use them to make a broad political statement. They make condescending, stereotypical remarks to Granny, reflecting their prejudice toward blacks.
Another conflict represented by the conflict between Granny and the filmmakers is that of the poor against society. The filmmakers seem to be making a statement against giving food stamps to the poor. They reflect a society that doesn't understand the needs of the poor, and the filmmakers make assumptions about Granny and her family that reveal their uninformed attitudes.