Some Anvils Need to Be Dropped: "Laws benefiting the wealthy would be significantly unfair to those who lack the wealth to influence the government", showing through the miserable life of Tom the Pauper when Prince Edward VI was in his position, had proven to be timeless.
Then there is Mickey's promise to safeguard the kingdom in his stead; he just sounds so broken, watching his friend's father pass away before and knowing full well that only the Prince can see his promise through. He nevertheless honors the king's wish, letting him die peacefully and from then on works to restore his friend to his rightful throne.
It also applies to the Prince who didn't find out about his father's death until a passing boater informed him. The grief of losing his father was hard enough, but it was also coupled with the fact that he wasn't there to say good-bye. His long silence after hearing the news made it apparent. A book adaptation of this version has him crying about this while imprisoned with Donald, who tries to comfort him.