I do wish this guide went into the specifics of dealing with Webpack and Babel. As solid as CRA is, Webpack and Babel are very leaky abstractions and I think every JS developer eventually requires some Webpack- or Babel-specific knowledge in order to solve some issue. While CRA is mostly effective at hiding these details, I'm not sure it's close to the safety and sureness you get from a comprehensive working knowledge of Webpack and Babel.
I also second the recommendation for the react-redux-links repo. I've never been in need of a reference for something React-related and been unable to find it there. It's a great , well-thought-out resource.
(Hey @acemarke, jsonnull here)