As long as you are booked on the "QF" designated flight, you should be fine...
You can also redeem points for services to Norfolk Island, provided the redemption places you on the QF codeshare flight.
Enjoy Norfolk Island... If you want to know anything about the place let me know. I had the pleasure of flying the Fokker100 BNE-NLK-BNE when Alliance was operating the aircraft on behalf of Norfolk Jet Express, so can't tell you much about the 737-200, but would be more than happy to help you with any questions regarding what to do, where to stay etc.
Cheers