ShortBus,
Neither really. The diff plug has a splotch of red paint on it and there's a drip near it on the diff, but they're not connected.
The paint on the transfercase filler plug is splotched on too and in the threads near the top. Theres also a glob of paint nearby it too.
Some big pictures are here:
Front Diff
Transfer Case
in this case I couldn't get the camera to a better angle, but I can see that the paint does not make a nice connection from the plug to the case.
It just looks sloppy.