I suppose don't make fun of the interviewer makes sense.
Other than that show up on time, be polite, and don't embarrass yourself.
That's about all I can think of. Sorry if it isn't much help.
Ach... I'm probably too late, but.. be confident in yourself, and if asked a question, take a second or two to answer...it shows that you are willing to think instead of just blurting out something immediately...
I have never had a real interview, but I have had a few practise ones at school in 'Business Studies' . Always keep calm, don't fidget around, don't move your hands around too much (we practised with no tables and it 'supposedly' looks professional to keep them together ), keep eyes on the interviewer at all times.
. Always keep calm, don't fidget around, don't move your hands around too much (we practised with no tables and it 'supposedly' looks professional to keep them together 
dont be nerves 
keep yer cool, and answer all questions, with out says "er ......." all the time 
