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Though butterfly's meanings can vary in different cultures, all of them are associated with the rebirth and change. The change from a caterpillar to a beautiful butterfly represents a positive transformation. The movie tends to hint on a powerful change that is long overdue.
From this article of Screenrant (emphasis mine),
Butterflies mean different things ...
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For the last one, also, the title is probably a parody of that scene from The Lego Movie.
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