Lights on the car which were broken when the car arrives on the beach during the chase are fixed when the car leaves the beach.
Barry Newman is taken from shore to a short distance from an oil rig. Donning scuba gear he swims to the rig, climbs aboard , hides the oxygen tank, mask and flippers and starts to explore. He hears 2 workmen talking as they approach the walkway and climbs over the side to hide but his hood is now up on his head then back down when he enters a cabin area.
Headlights on the car which were broken when the car arrives on the beach during the chase are fixed when the car leaves the beach.
The wreck of the aircraft, when found, is referred to as a "Dakota". This is a purely British term for a Dougas DC-3, ad would not, therefore, have been referred to by the Americans involved as such.
The skulls of the people in the plane would not be able to be seen. As there are no muscles, tendons etc holding the skeleton together, the bones would be piled on the seat and floor of the cockpit.
After Talbot has kidnapped Sarah Ruthven from the courthouse, he steals a car and is driving through town to make his getaway. He skids on open ground to avoid a green car and the camera lens gets cracked in the top right of screen by the thrown up dirt.