He is responsible for everything he files with the US government. If the information has changed since his first application or if he answered a question incorrectly on his first application, he can - and should - explain any differences to the consul. Honesty truly is the best policy here.
Your father will likely be asked to explain the discrepancies between the two forms.
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When an official document is completed, signed and filed by the applicant, the applicant is assumed to have answered all questions honestly and completely. Failure to do so may result in serious consequences. There is a possibility that your father's previous 160 will not be reviewed if he submits an updated form.
Yes the information you previously submitted he will be responsible for its veracity. A discrepancy between the two filings will require explanation.
Attorney Robert Brown's (former INS Director, 1972-99) reply to your question is general in nature, and does not constitute legal advice as all facts are known to him. For specific advice or representation you should retain an attorney experienced in immigration law. Mr. Brown's reply on AVVO does not create an attorney/client relationship not constitute legal advice.