Big Change vs. Small Change

As Lina and I were working on our project, I came up with a different interpretation of "change" in Caroline, or Change. Noah leaves small change, like quarters, in his pockets to see if Caroline will take them. It's as if he wants her to take the small change. When he leaves the "big" twenty dollar bill in his pocket, though, he gets into a huge fight with Caroline and wants the money back. I interpreted all of this as meaning that Noah wants her to take the small change and make a small change in their relationship, like Caroline admitting that she cares for Noah. Noah wants her to love him like a son. He doesn't want a big change in their relationship, like Caroline leaving for good, which could be why he is so apprehensive when Caroline finds the gelt in his pants pocket, and he doesn't want her to take it. Just a thought. Ideas?