As Shane & Andrew depart for Fraser Island, a close-up of the plane shows a different registration to that of the wider shot of the plane taking off (It is later revealed that the different registration is that of the last plane to fly, caught by Michelle & Jo).
When Steve replaces Adam & Dane (which matched Paul's answer) with Sticky & Sam as his answer to question 5 in the "match what your partner is thinking" challenge, a buzzer sounds but the graphic of Adam & Dane at the bottom right of the shot turns green, not red.