When Francis returns to his wife's house, the kitchen floor has 12-inch vinyl composite tiles (VCT tiles). While VCT did exist in the 1930s, they were only in the 9 inch size. 12 inch VCTs were not made until the 1970s.
As the trolley carrying the scab played by Nathan Lane approaches the worker protesters, there are no trolley tracks in between the mob and the trolley. In the next shot, they suddenly appear in the dirt under young Francis's feet.