For whatever reason (maybe I was moving fast enough), I had some trouble getting my sprinkles and coconut flakes to stick to the outside of my truffles. I got around this by rolling my balls in a little bit of extra chocolate extract to get them wet, and then rolling them in sprinkles/coconut flakes.
Also, if you're like me and the first thing you think when you see "medjool dates" in a recipe is "what the hell is a medjool date, and where do I buy it?", you might find
this article from The Kitchn very helpful. And FYI, I got my medjool dates at Whole Foods, in the section where there are all those bins (like at a candy shop) full of oats and nuts and other stuff you can use a little shovel to fill plastic baggies with. Safeway also carries them.