The position of Pen's arms change when they encounter the strange men on their hike.
As the four friends are driving back from the airport along a very twisty road, a dark silver car coming the other way suddenly turns into a pale cream car.
When they are lying on the beach and watching a plane fly over, the dimensions of the shadow of the passenger plane are much smaller than the size of an actual airplane, which doesn't make any sense.
Harry says he was 16 when "Emotional Rescue" was released, but that album was released in June 1980 and Harry's passport birth date is in August 1961, so he was nearly 19 when that album came out.