Was rewatching TNG and came to Hide and Q. There's a shot where Wesley finds himself back on the bridge, just after being stabbed. He looks down at his chest and is feeling around for a sign of the wound. I'd say he definitely remembers it. Now, there could still be in-universe ways around the flub. In the Voyager episode Unforgettable, the Ramuran emit a pheromone that causes memories to fade after a few hours. And if they can do something like that, so can Q.