The difference is that Toyota fixes them before NHTSA demands a recall. It looks better for PR.Mitsubishi Motors' reputation has been battered by a scandal over the systematic cover-up of auto defects that subsequently resulted in massive recalls.
The scandal surfaced in 2000, when the company acknowledged it had hidden defects for decades, secretly repairing them without proper recalls despite reports of dozens of accidents.
That part of the article jumped out at me. Toyota seems to do the same thing. It is probably a corporate culture that you find in all of the Japanese based automakers. It just hasn't caught up to them all....yet.