How Saoirse Ronan captured teenage angst for her ‘Lady Bird’ role

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Saoirse Ronan has been acting since she was a kid and did not have a “normal” upbringing, so she had to find a way to channel her inner teenage angst for the title of in “Lady Bird.” She tells Sunday TODAY’s Willie Geist how director Greta Gerwig and the television series “Saved By The Bell” helped her for this role.