What are the unsolved mysteries of the animated film "Crayon Shin-chan"?

I have watched hundreds or even thousands of episodes of "Crayon Shin-chan" and discarded all factors that affect the animation effect, such as cosplay plots when they disagree, sudden scene changes, earthquakes, and tsunami time and space bugs, Shin-chan is always five years old, etc. These are themselves meaningless factors in the anime setting. "Crayon Shin-chan" does still have many unexplained and unexplained plots.

1 Ah-Dai’s Family

Ah-Dai is a very smart child. They all say, “Look to Fengjian in good times, Xiaoxin in bad times, and Ah-Dai in desperate times.” Ah-Dai, who likes to study stones, often says He makes some astonishing remarks that even have a certain level of philosophical speculation. For such a very smart dumb guy who seems to have no shortcomings except for a problem with his nose and a frequent runny nose, the author has never talked about his parents and family, parent-teacher meetings or Only Nini’s mother, Kazama’s mother, Xiaoxin’s mother, and Zhengnan’s mother showed up at campus activities, and the four of them often met privately to discuss the children’s affairs, but they all seemed to often mention the child “Dumb” and it was strange. Selectively forget "Dumb's parents".

2 Dr. Delang

Amei’s only official partner who occupied the episode count for more than ten episodes in the second season, Dr. Delang, has said that since she left Japan After going to Africa to mine fossils, he never appeared again. The last scene in the animated version was just Mr. Matsusaka rushing to the airport to see him off. After that, there was no conversation again, and the animated version never mentioned this person again. It seemed that everyone People have selectively forgotten the existence of this person, and it seems as if he never even existed. Teacher Matsuzaka is still the 24-year-old "older girl" with a small belly, a good figure, and a good face, but she is not pursued by handsome men.