Or it was staged. Poorly. There were cameras in positions that didn't have cameras in other angles (off the ground, near the button, but no object to hide a camera on at that point, and most likely not a "zoom and enhance" deal). However probably fake it was, it was still a pretty good commercial.
Oh, and they could have done it a few times and taken the best takes from it. So a half-fake thing. Definitely not a hidden camera deal though.