What are the basic common sense mistakes in Tiny Times series?

In the movie, when the four sisters graduated, their bachelor's uniforms were all yellow collars, but yellow collars were bachelor's uniforms for engineering. The collar of a bachelor's uniform is red in military school, green in agriculture, gray in science, white in medicine, yellow in engineering and pink in literature, art and sports. Lin Xiao is a Chinese department with a double degree in accounting and international finance, Tang is a physical education department and Nanxiang Fine Arts department. Therefore, the collar colors of the four undergraduate school uniforms are all wrong.