"Cloud Atlas" film's got some yellowface goin' on.

Maybe someone can help me with this one bcz I might have entirely gotten things wrong. So I'm watching this trailer for an upcoming Tom Hanks / Halle Berry movie and I see something really strange. No, not Hanks' facial hair; Jim Sturgess in Yellowface[starts at 1:53]:
That is Jim Sturgess, right? Anyways, here's the directors explaining the film, in which they comment that the actors are to play multiples rolls: different ages, different races, and different genders[starts at 1:05]:
I don't get it. Even if people are perfectly "cool" about this, how can you look at that guy's face and think he looks perfectly normal? Oh, wow, and it's Jim Sturgess from 21. How odd is that?

*edit*
Apparently the two actors play different roles in another part of the film, and from this image it looks like the actress, Doona Bae, is playing a white lady?