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According to CelebHeights.com, De Niro is a respectable 5'10", and Pacino is 5'7". The three-inch platforms (I’m guessing here. Maybe they are four inches?) make for a much more dramatic difference in height.
5'10", I didn't know they stacked shit that high! From that picture, it is shit. "You tryin' to squeeze an inch in on me somewhere, huh?"

https://jezebel.com/is-this-shoe-ok-...n-s-1837270914