Trivia: Adrian Brody insisted on learning to play the piano himself because he detested the idea of him being in a long shot pretending to play the instrument and then the camera showing someone else's hands on a close up shot actually playing. He said he hated that, not just for him, but on any other film that had such a scene. So he went and took lessons, practicing for hours on end.
Trivia: When director Roman Polanski won the Oscar for "Best Director" during the 2003 Academy Awards ceremony, he did not attend because of his statutory rape conviction in 1977. If he returns to the United States, Polanski will be immediately arrested once he steps into American soil. On late 2003, actor Harrison Ford presented the Oscar that Polanski won in March during the Deauville Film Festival in France.
Trivia: Adrien Brody could not play the piano. The film producers hired four professional piano teachers to teach him the piece from scratch.
Trivia: In order to look authentic for his role, Adrian Brody was required to lose weight, even though he was already lanky enough to begin with. He lost even more weight, and that, among others, made his Oscar-winning performance more memorable. He looked so thin that he was asked: How did he do it? His reply: 'Don't eat. I'm sure there are other ways, but the quickest is don't eat. It was excruciating.'
Trivia: Adrien Brody won an Oscar for this film. At the age of twenty-nine, Brody is the youngest man to win the Oscar for Best Actor.
Chosen answer: In the scene, we see the old man being lifted in his wheelchair. Then, there is a cut-away to the family watching from across the street. Then we see someone being dumped from the chair and falling, but we never see him hit the ground. My guess from watching the scene is that the stunt person fell into a cushion which was removed in post-production. Generally, when confronted with a question such as this, I like to refer it to someone who would be in the know - in this case, the stunt team on the film. I looked up that team on IMDb.com, and searched for the individuals on Facebook. Of the twenty or so stunt people and coordinators, I could only find three with unique profiles that made me think I might have the correct individuals: Janusz Kadlubowski, Stella Kuczynska and Zbigniew Modej. I posed your question to them. However, given that I am not connected on Facebook to any of them, I have no idea if or when they would see my message and respond. I will update this answer if I receive further information.