Kenny and son are traveling to the Ocean Grove caravan park where his father lives. On entering the park the camera is focused on the back of Kenny and his son walking toward Kenny's father's cabin, you can see the right-strap of Kenny's overalls 'inside-out' and twisted. As they get closer to the cabin and the front door you see the right strap of Kenny's overalls 'neat' as it should be, however upon leaving his Father's cabin the right strap returns to it's 'inside-out' & twisted position.
When Kenny takes off from Australia he is aboard a Airbus 380-300 aircraft, and when the plane finally lands he is aboard a Boeing 767. This plane is also landing at Melbourne Airport, not the USA.
When Kenny goes to pick up his son for the first time and we hear the door close sound-wise, the door is slightly ajar as the handle was not turned to signal the door closing.