Acting abilities and scheduling conflicts are legitimate concerns, but Mouse, you missed my point.
I'm saying they didn't have to change the character's race, either the first time or the second. At least one of those race changes was unnecessary.
Or are you telling me
1) they couldn't find a good white actor(s) to play Harvey Dent/Two-Face from movie #1 on...
or
2) they couldn't find another quality black actor to fill Billy Dee Williams' shoes, thus at least maintaining the character's new racial identity?
Instead, we get a discontinuity.
Ah. I see what you're saying now, but I don't think it's an example of "change for change's sake." For it to be, the race of the actor would have to have been a deciding factor to the studio one way or the other, and frankly, I just don't think it was. I think it more likely that they just didn't
care. (Much like the character of Felix Lighter in the Bond films, who has been white and black.)
True, they (probably) didn't say "Let's make this character Race X for Reason Y." But for me, when I hear "change for change's sake," it means that someone has to have consciously decided to make said change for no other reason than because it was different from what came before. And I don't think that's likely what happened here, because I don't think there was any conscious decision at all in that regard. I think the studio probably
also didn't say "Let's make this character Race X just for the hell of it." I believe what they probably said was, "Let's cast Person X," and when someone pointed out that it would change the race, they said, "So?"
In other words, that particular change doesn't fall into
either the "motivated change" or the "change for change's sake" category. I think it falls into the "repercussions of some other decision that nobody cared about one way or the other" category.
Of course, I could be wrong. Maybe Burton
did specifically want a black Dent. Maybe the studio specifically wanted a white Dent. I'm obviously not privy to that. But if so, I'd wager some real money that each had his reasons--even if they were bad ones.
But what I'm getting at is, not every single change needs to be one or the other, "motivated" or "for change's sake." Sometimes they're just the natural results of a prior decision, and nobody felt them important enough to remain consistent.
So yes, they could have found a white actor for the first one, or a black actor for the third. I just don't think, once they had their first choice, that they could be bothered to worry about it.