Peppy and George's tap dance - with sound! - at the end of the film, indicating that George has finally overcome his depression and is moving forward in his life and career.
Meta-example: This movie was the first silent movie in decades. It wasn't just a film without words, it wasn't just black and white. This was a full-on replication of a film from the silent movie era. And it won Best Picture. A film genre that has been pretty much dead for nearly a century was resurrected for one hell of a final ride.