Next time he gets a hold of cooked bones and you're scared of the splinters puncturing his stomach and GI tract, you can feed him handfuls of bread because that supposedly coats the sharp ends. I wouldn't induce vomiting, however, because the pieces might come back up and scratch his throat.

Like .sarah mentioned, the wings could have been coated in some heavily spiced/spicy sauce, so it might upset his stomach. You can fix this conventionally or holistically. Stomach upsets and nausea are usually fixed with lemon extract, ginger, and cayenne pepper, and then you can help firm up his poops with canned pumpkin. OR you can just feed Charlie a spoonful of Pepto Bismol, LOL. I usually do the latter.