The shot from the airplane taking off at the end shows a clean runway with large white numbers and large white lines. The shot from the runway of the plane taking off shows an overgrown runway (or road) clearly not used in years, with a yellow stripe down the middle, and no white lines or numbers.
Near the beginning of the film, when the girls are walking along the back roads and Pete drives past them, the road is completely deserted in both directions apart from his car. When the camera switches to Pete, he clearly passes multiple cars coming from the other direction
During the mess hall scene where they bring Pete a hamburger, he pushes it away saying he doesn't eat meat. One of the soldiers then takes a few bites. Nobody touches it again after that, and yet the hamburger repeatedly changes from untouched, to bitten, and then mostly gone.
At the range, Rosie fires nine rounds from a revolver without reloading. While a very few revolvers hold more than six rounds, this one does not, as can be seen in the front view of the cylinder.
When pete is shot, he is still clearly breathing as you see his chest move.