The two male ravens are named William and Jacob, after Jacob and Wilhelm Grimm, the Brothers Grimm.
After sending away the ghost of Mrs. Baker, the man says "Nailed it." That's the name of a show hosted by Nicole Byer, who voiced Mrs. Baker.
In the original book, Hansel and Gretel running away is actually the second chapter, as the first tells the story leading up to (and ending with) their beheading and resurrection. It also tells the story of the "mysterious figure." Chapter one is adapted into episode seven.