5. Unnecessary Extra Information
Do not give information which you were not asked. People try to be over confident and over smart give out more detailed answers than is needed which may lead to additional related questions which may work against you.
Question: Why do you want to go to the US? Wrong
Answer: I want to see how USA is and if I like it I want to stay back with my son. Preferred Answer: For tourism purpose and/or to spend some quality time with my son/daughter.
6. Inconsistent Information
Difference in the information you provide in the documentation and what you say during the interview can go against your case.
7. Arguing with the Consulate
Officer Never argue with the consulate officer. If you want information ask in a polite manner.