I have a Theory

You know those times when Shadow says something but the other characters either dosent hear it or dosent understand. Like at episode 4 when shadow asks Beta did they hire extras or the scene at season 2 episode 9(I think) where Shadow asks Victoria is 666 an employee ID. I think he is saying those in Japanese and that's why no one respond or notice them. Because as we know from volume 5, in the Teis world, they don't speak in Japanese.