smile...eye-contact...and. do not use the words---teamplayer, multi tasker, people person. those words are played out and over used. get inventive and unique in decribing you and your skills/qualifications. Good Luck
Dress conservatively, be polite and use proper grammar. Show enthusiasm for the job, smile a lot, listen quietly, make sure you hear the question and then answer it specifically. Overitinox had some good suggestions.