In 1947 motor pool there is a quad headlight bezel on wall. Quad headlights were not introduced until 1957 by Nash.
When Dr. Grant is first in the diner with Adam Barlowe he is seen smoking, and offering to Adam, filtered cigarettes. We are shown that the year is 1947 but filtered cigarettes were not introduced in the U.S. until 1952 when Kent introduced the "Micronite" filter that, oddly, was touted for its health benefits; but was actually made of asbestos. And they were not readily available until Winston filter cigarettes were introduced in 1954.