Diego Luna's 'Chau' -there might be a SPOILER-

This question is mainly for Mexicans, I think, that if Diego Luna's character was supposed to be Mexican, I don't recall it right now.

Anyway the thing is that 'Criminal' is a remake of 'Nueve Reinas', a bad remake in my opinion but whatever.

The thing is that many things changed in 'Criminal' as to adapted to an American audience (such as the casino scene instead of the gas station, the amount of money, the bill instead of the stamps, the reason the buyer has to leave the country, the bank thing and of course, the language) but when Diego and John go to pick up the bill (I think it was then), when they are leaving Diego says 'Chau', which was the line in 'Nueve Reinas'. What I wonder is if they forgot to adapt that line or if the Mexican community in the US say 'Chau', since I thought that was used in Argentina and Uruguay. I thought in Mexico people said 'Adios' or something like that.
I really don't know but I feel curious about this meaningless detail, if anyone out there could enlighten me I'll appreciate it.


~Dream: Don't rush to master the 'how' (technique) & then brush past or forget the 'why' (meaning)