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Not Carrying Appropriate Fee
The US consulate has strict payment methods. Make sure you are aware of the method and the exact amount of the fee. For example, US consulates use bank drafts for visa application and visa issuance fee and not cash.
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.
For example:
Question: Why do you want to go to the US?
Wrong Answer: I want to see how the 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.