Red paint on diff/transfercase fluid plugs...does it mean anything?

[ree]

I was just checking my differential and transfer case fluid levels on my 2003 H2 and noticed that the transfercase filler plug has red paint on it as does the front diff fluid plug.

Also the front diff plug isn't like the one in the manual's picture. It's got a bolt head instead of a recessed square drive hole.

Is this normal for original equipment on a 2003 H2? I only wonder since I'm the second owner of this hummer.