At 1:56, he totally decks that little girl in the chin and just continues singing. The candyman is a dick.
I'd say it was a prequel, but honestly it makes no sense storywise if you compare it to the others.
" Has it gotten into all the supernatural stuff yet? "I'm guessing that's in the books (haven't read them), but no. The show is has, up to this point, been strictly a serial killer in real life events.