* Rio Grande didn't use that logo until 1945 - I thought your layout was set in the 1930's?!
* The barbed wire is on the wrong side of the posts - it should be on the cow side!
* Why didn't you update all the reweigh stencils to match your target year?
Turns out that Los Angeles historians can be just as picky, as the gang writing a blog about Los Angeles in the 1940's show in their critique of the LA Noire video game. Personally, I'm impressed the video game designers did as well as they did, even if they had 1959-era lettering on a 1947-era building:
We're careening up Fig, and in the distance, the Architects Building, but see those letters atop? They read "Douglas Oil" and weren't placed there until after Douglas purchased the building in 1959. Guess you should probably be more worried about the big scary car crashing into you, and all the flying sparks, but, well, we each have our own issues.
They're still nice people over there, and I've found their On Bunker Hill website has some nice photos and stories of Los Angeles's Bunker Hill neighborhood before it got razed for redevelopment in the late 1950's and early 1960's. If you're a fan of film noir movies filmed in the area, there's still some great articles here.