The batter should be lumpy — that was the correction that changed everything for me. Overmixing develops the gluten and gives you flat, chewy pancakes, and everyone's instinct is to whisk until smooth. Chef Emily told people to stop while it still looked wrong. The other useful detail is tossing the blueberries in a little flour so they don't all sink to the bottom, and the whipped ricotta on top is a better idea than syrup because it isn't purely sweet.
Hugo