dude it probably really does this is like only the trailer and this is japan we're talking about here... that makes me like 99.99% sure there's plenty of that in the movie xD
I always wonder how Japan reacts to our movies. Do they consider our stuff as weird, as we consider theirs?
a friend of mine who went to japan enlightened me on the fact that almost zippo of western culture makes it into japan and the stuff that do seems arbitrarily chosen because not popular at all in the west. so no they are actually sometimes completely oblivious to how weird that are. (but of course they do relish radom and self-sattire humor in a way far beyond our own)