I have personally observed over and over that there are certain classes of mental mistake that you simply CANNOT reliably correct in non-interactive media, because the person making the mistake simply can't tell they're making the mistake unless you point out an example of it in their own behavior or thinking.

I know I don't really get a given cognitive bias unless I can think of an example of me doing it and feel stupid at the realisation. (I have previously generalised from myself on this point, but I'll try to refrain from that.)