To Have and Have Not - a minor theme

I probably won't have time to re-watch the movie before the rental period expires, so these thoughts are necessarily a bit sketchy.  But in between admiring the two dazzling megawatt stars at the film's core, from time to time I couldn't help noticing the non-white actors.  They are mostly background, portrayed "positively" -- supporting or helping the good guys, or pursuing their own neutral interests.

• Early on, many of them are fishing off the dock with simple rods and lines, a contrast to Harry's fishing boat and the $275 rod and reel he rents to paying customers.
• When Cricket (the headliner piano man) starts playing and singing, the man on drums and the man on base are genuinely pleased, and pick up their instruments happily.  There is perhaps a sort of equality and appreciation among the musicians?
• Some of them are there simply to serve the white clientele (e.g. the bartender).
• Virtually all are nameless; I'm thinking Horatio (in Harry's fishing boat, whom Harry defends economically to Johnson for his skill and speed in tying) may be the exception.
• In their residential area, a woman and her young boy actively collaborate to protect the wounded Resistance fighter Paul.  This seems significant, as they are surely risking death and disproportionate reprisals if they are caught.  (Presumably others in the neighborhood are aware as well; the white folks certainly stand out.)

Other miscellaneous thoughts:

• Eddie is carefully portrayed as a man with no redeeming usefulness and no arc of character improvement.  There is a moment early on when Harry is telling Johnson how much he owes.  Eddie seems to be doing the arithmetic on his fingers at the same time, and starts to disagree, when Harry tells him essentially to shut up.  I thought at first perhaps this was intended to show Eddie's honesty relative to Harry, but actually the math is exactly right.  Overall, overtalkative Eddie's only positive contribution to the adventure is that he somehow does not manage to sabotage things by spilling the beans to the Gestapo (though this seems to be due more to forgetfulness than anything else). I kept waiting for the movie to either reveal some useful trait or some unintended betrayal; neither eventuates.  
• With all that, I suppose Eddie's main purpose in the movie is to give us a cue early on that Harry is not as hardboiled as he seems.  By contrast, Marie/Slim is left more mysterious and ambiguous in terms of her alignment, initially -- though I suppose Harry's insistence on the Resistanee folks speaking freely in front of her shows that she is ultimately to be trusted.
• Marie's apparent jealousy of the wounded Resistance fighter's wife Hellene struck me as a bit strange. Presumably we are expected to see that she accurately spots the manipulation and wiles of a "competitor," but I'm not quite sure what the other woman would have hoped to gain from it.