The scene in which Young Joe (Joseph Gordon-Levitt) falls off the fire escape was filmed on the actor's 30th birthday. Gordon-Levitt was left hanging on the stunt wires while the crew sang "Happy Birthday" and wheeled out a birthday cake.
Joseph Gordon-Levitt was fitted with prosthetics, and studied past movies, in order to play Bruce Willis' younger self.
Joseph Gordon-Levitt was so successful in his role that Bruce Willis recognized his own mannerisms in their scenes together.
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