Corrected entry: In a scene where the principles are standing in front of a car, the license plate is yellow with a white sticker in the upper right corner that is for the year. However license plates back then did not have stickers for the expiration year. Those plates had the year as part of the plate itself. those plate were replaced each year. There was no such thing as an expiration sticker as we have now. And this mistake is repeated several times throughout the movie.
langford
12th Feb 2013
Correction: Those aren't stickers. The year section was silver in 1949.