Board Thread:Consensus Track/@comment-27047819-20151130221353/@comment-27327964-20151203094532

I am very sorry to interrupt between you two but I believe that Omojuze wishes to say that faceless characters are not errors but are the writer's way to signify less important or filler characters in certain scenes.

This is not the first time Mr. Ohkubo does this as well so it is sort of like a part of his drawing style. Errors in pictures are almost always accidental however and are not done on purpose.