It is said to be a minor element because it does not occupy a major position in the film. But it is this seemingly dispensable element that played a crucial role in the film's influence.
When Charlie’s feelings for her uncle Charlie were positive, Charlie and her uncle took to the street, holding her uncle in her arms and being proud in front of their companions. When the emotions changed, Charlie's sister also asked to change seats. And the topic of murder discussed by Charlie's father and neighbors. and many more.
It is the expression of emotion at each stage, the transition between the stages, or the foreshadowing of the theme of the entire film. Both played an important role.
A good movie will not waste any of the available elements.
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