Bell is clearly about my age, given the cultural references, so it might have been helpful to have a year mentioned, so that readers would have an idea that the technology of hearing aids might have changed a bit. My cousin had a device similar to Bell's Sonic Ear, and it was a very large device; even my reader says that before she got an implant, she had a unit that was rather cumbersome. The additional information in the Superpowered edition helps a bit. There are more pictures of Bell as a child, and some pictures of her report cards as well!
The notes on the creative process are interesting; there are preliminary sketches, and notes on how graphic novels are produced. While I knew that lots of books mention "colorists" I hadn't quite grasped that another person created the palette for the book, working closely with Bell, of course. I loved the mix of photos of places and people that came into play in the book and the details of how she works through bringing a story to life from written ideas to a finished and colorized graphic novel. Even if you've read the original 2014 book, it's a treat to pick up this "new and improved" version!