It seems there might be some confusion. As of my last update in January 2022, there isn't a widely recognized movie titled "Greatest Cartoons of the Golden Era" specifically featuring Charles Dewandeler. However, there are documentaries and compilations that celebrate classic cartoons from what is often referred to as the "Golden Age of Animation," roughly spanning from the 1920s to the 1960s.
If this is a recent production or a lesser-known film, I might not have information on it. Could you please verify the title or provide additional context? If it's a hypothetical question or related to a less mainstream production, details might be scarce.