You think casting is done?? Oh...oh no.

You don't need faces but you need a variation in clothing for crowd. Hmm, no Henchmen but there are workers of every sort isn't there? Just a headsup. One technique for crowd and subject is to make the crowd entirely one color like gray or brown, I mean clothes, skin and hair and have your subject fully colored so that your subject stands out. Well your script will cover that and you'll have to respond.