In my own experience when i got my individual hearing with I.J. for asylum application and when i got my interview with I.O officer for P.R. interview, all they wanna hear from you is the same thing you stated in your application.
They wanna see if your telling the truth, thats the most important thing to do. And just explain any thing they didnt understand. do not get'em more confused, and the night befeore your hearing or interview read your statement, so you dont get confused your self, they will ask you based in your saying.