The plane shown on the ground, and making its take off roll is a B-25 with it's twin tail. But the plane shown in the air as it flies away is a B-26 with its single tail.
When Baldwin and his unit arrive at the ammunition dump they're supposed to blow up, it consists of several small buildings and shacks. But the interior shots showing mountains of ammunition have no resemblance to the buildings they're supposed to be in: two of them are clearly gigantic tunnels ten or twenty times as long as the buildings that are supposedly being inspected.
Major Baldwin's jeep is obviously a post-World War II model, with the visible differences being the jeep seen in the film had larger headlights, a gas tank filler neck and cap in a cutout in the left rear quarter panel (instead of under the driver's seat), and the axe and shovel were affixed under the right front door cutout (instead of under the left front cutout), all different from World War II jeeps.
The M1 carbines the soldiers are equipped with are the post WW2 model, as can be seen by the bayonet bar under the barrel. This was not fitted during WW2.
The 3/4 ton trucks shown throughout are M37s. These were post war and are correct for Korean war but WW2. around Some on else mentioned the jeep being wrong. They are M38 which is 1950 onward.