I have no problem with Japanese people being Japanese in a Japanese commercial.
But seriously, what the fuck? These kids are having the happiest day in their life, all for their favorite cartoon's new straw and what seems to be, orange juice. Wait a minute, since when do people who eat at McDonalds consume anything even remotely healthy? Do Mexicans work at all the McDonalds in Japan as well? Also, how well do they speak japanese?