They've already done a few stealth cameos that seem to be sticking with the Disney Afternoon theme. I don't like that Darkwing Duck is just a TV show in this world (and the same one at that), but seeing Don Carnage and the reference to the Gummi Bears was pretty fun. It would make sense to toss in a little Goof Troop or Rescue Rangers nods, though they might have to be subtle.