On some level I'd like to call out the confusion between sumo and jiu-jitsu, but then I noticed the skin tone assigned to the 'Jap Wrestler', and decided that's what we should all be focused on.
You know what's extremely interesting, Dollman? The fact that the diary writer realized that there was a limit to the amount of text people snooping through his thoughts would be willing to read, so he increasingly moved to pictographical representations of his own life story.