These aren't small mistakes. For whatever reason, I guess God had a real love affair with the worst secretaries imaginable.
God: Tell everyone my love is unending and there is eternal salvation for any that should seek it.
Young: Oh, blacks can't have the priesthood because of a curse, it shall never be lifted, or it shall under ridiculous conditions, blacks are uncouth, uncomely, of sub-human intelligence, and wild, and if you marry interracially god will strike you down? Got it. Crystal.
God: ... (for 130 years) Oh, sorry! I was busy. Brigham, you heard me wrong. Brigham?
Kimball: I'm here, sir.
God: Oh, yes, well, every male is to have the opportunity to earn the priesthood.
OR
God: Remember how the restorer of the one true gospel gave the priesthood to two black guys?
Young: Yeah.
God: Just kidding. They're grand-fathered in, they're cool, but you can't let any other black guys have the priesthood.
Young: Why not?
God: Because Cain slew Abel 6,000 years ago.
Young: Okay, that's cool. But why now suddenly? This was never a specific policy before, and even if it was, did it just slip your mind in those many direct conversations with President Smith?
God: Don't worry about it. That's just how it is, and how it will be forever or somewhere pretty close to it.
Young: Okay.
I'm pretty bummed if these are the best answers the arbiter of creation and his chosen mouth-piece(s) have for us.