The location of the bayonet on Major French's belt changes between shots.
In town, Major French's hat is old and worn, matching his uniform. At the cave, it is newer.
Goldsmith says, "The rest of the world have all died of radioactivity, strontium 90, plague." Strontium 90 is a radioactive isotope of strontium, making it redundant in this case. Strontium 90 is dangerous to humans because the human body treats it like calcium, and it's taken directly into bones.