Me thinks it's all to set the mood... the teal is dark and ominous .... such films as batman/matrix/ sci-fi flicks like alien, predator, etc,  and other along that line use very dark scenes.... the orange.... well, that imparts the old timey feel. Quite appropriate for Oh Brother.... but maybe not all the way through..... use it sparingly to give the feel of age, and in other flicks to denote time periods past when the plot jumps back and forth through time..... but that would be common sense.... and is Hollywood known for that attribute?

Moshkiae
 
Rain, now you know why I tell you guys to check out different things!
 
Because everything else you are hearing and seeing is exactly the same format, just a different note and lyric!
 

 
As a matter of fact Mosh, coming from the only French speaking province in North America, and one with a very singular culture, I was exposed to a different kind of culture by default, and one that's been exclusive to us in 90% of the cases.
 
Some of that stuff sucked, but some of it is amazing and I feel bad for anyone who wasn't born in the right place to appreciate that. 
 
It also means that French (from France) cinema and culture have been part of my daily life almost from birth. I can read La Chanson de Roland in Old French just as well as I can read the Sweetwater catalogue.
 
I studied French literature - and on my own time, I'd study "foreign" authors - Russian poets, German philosophers or the Beat Poets, etc - anything I could put my hands on.  I was also an avid reader of anything related to art and painting, psychology and mythology - especially Greek mythology. I also took a few cinema classes. 
 
In fact, like Bit, I too am a die hard fan of Korean/Chinese/Japanese movies. 
 
So it's not a matter of awareness...

I know I enjoyed Pan's Labyrinth, subtitles and all!