Meh... they could have included metric measurements. It wouldn't have changed much (if anything), but would've made the book usable for us who don't do ounces and Fahrenheit and whatnot without having to convert the units.
Super-excited for this book. I still crack open the Leaves From The Inn of the Last Home and make some of those recipes.
I've mixed up the Mindflayer cocktail a couple times. I'd recommend doing it as just a shaken and strained drink, not blended with ice. Granted, I'm generally biased against blender drinks (one exception being the Painkiller).