At the sporting good store ruins, Bemis finds an already loaded revolver in the display case. A loaded revolver would NEVER be kept in a display case.
Despite the shock wave from the H-bomb that detonates while Bemis is in the safe, it breaks the crystal in Henry Bemis' pocket watch, yet his glasses do not shatter.
"The Daily Chronicle", the newspaper being read by Henry Bemis in the bank vault, despite its being "published daily" (according to its front page) contains no date.
As Bemis walks to the destroyed sporting goods store he stubs his foot against a large boulder, which moves easily and then rocks back and forth as his hand touches it on the way down.