This Is a similar idea of Speilberg in Shindlers List where he portrayed one little girl in color as a wakeup call to know that this stuff really happens because people associate black and white with past events.
The contrast between the people defined not just by class, but here visually with color seems, to me anyway, to also illustrate difference in times. The two times are similar in that the average person has been hit by the times, but now they look very different than they did back in the Great Depression.
The monochromatic "homeless" with the brilliantly colored middle class family really work well. I get the impression that they're not that needy but at the same time very much so. Maybe they have too many bills and can't afford groceries that week. Wonderful work. I agree about the boy's face too. It could have been exposed, but he's probably ashamed to be there.
Nice execution in general, tho' I'd like to see more misery that those average whites got into, and front 3 guys looking less like gangsters, or that was the point, making "breadline" to actually present gray market trough which even average working people are now finding the way out of crisis.
good presentation and execution...i knew exactly what it was about even before reading your comment...i really like the guy second from the right looking back as if to say "What the hell are you guys doing here!?"