Be an active participant! You need to be _interesting_... be excited for the job, excited to talk about your past accomplishments. You don't need to be jumping out of your chair, but if you're coming across as, "Ho hum, just another job interview" then I'm, "ho hum, just another applicant." I'm getting the message you don't really want this job.
Not excited for the job? Look harder, find something to be excited about. At least show you're interested in knowing more.