The glass partition in Celestial's cab keeps appearing and disappearing from shot to shot throughout the film.
The $5,000,000 in gold would have weighed nearly 139,000 troy ounces at the price of about $36/oz at the time. That equals over 9,500 pounds or about 4¾ tons - way more that what is shown in the few small boxes in the film.
As George Raft and Signe Hasso begin walking through the shadows toward and onto the covered bridge, one of the first shadows is the shadow outline of the cameraman on the lift basket as he films from above.