Okay, one thing I thought was interesting about this was that there was a big role reversal once Schultz and Django got to the plantation. For the first act of the movie Schultz is playing the professional, smart, experienced teacher as he's teaching Django the ropes of bounty hunting and gun fighting, teaching him how to read, and reminding him to be ruthless despite the ugliness of the job. However, once Schultz sees the trackers sicking dogs on a slave suddenly HE'S the one out of his league. This makes historical sense because in a lot of Europe slavery had been abolished for DECADES so Schultz had NO idea just how brutal it could get. He probably HEARD about it, but witnessing it was an eye opener. You can see him just about ready to lose his lunch at seeing that poor man get ripped to pieces by the dogs while Django has probably seen that before and is able to keep a straight face easier.
Another fascinating dynamic I found was between Candie and Stephen. Candie fancies himself some sort of gentleman and sophisticate, demanding he be referred to as "Monsieur" and keeping an air of civility. However, he's a complete fraud and an idiot. He doesn't know a lick of French, obviously gets off on the brutality of the Mandingo fights, had no clue Alexander Dumas was black, and was nearly swindled by Django and Schultz had it not been for his BLACK servant. Seriously, Stephen is obviously smarter, more cunning, and I doubt Candie could get his pants on without the man. Heck, Stephen even seems to be with Candie by CHOICE as at the end he's obviously not a crippled, stupid, stumble bum. It's just something I found FASCINATING about the two of them.