That question certainly won't make anyone upset!
I'm not sure what all the markers are, but here is what I have noticed.
1) - The spots on their noses. Normals can have these too, and I believe it has turned out not all spotnoses have them, so it is not a definite sign.
2) - Head pattern. They have a faded pattern on their head. From what I've seen, it tends to cover a larger part of their head than the markings on a fire.
3) - Light dorsal. It is subtle, but their dorsal is several shades lighter. You can see it on this animal on the spots that are connected to the side spots. The scales on the side spots are one color, then right where they connect to the dorsal spots, they suddenly get several shades lighter. This carries through to at least some spotnose combos. Take a look at the twilight (spotnose cinnamon):
http://www.ball-pythons.net/forums/s...light=twilight
4) - Busy pattern. So far, all the spotnoses I've seen have been somewhere between busy and very busy with their pattern. I don't know if this is really part of the morph, or if they just haven't been bred selectively for reduced patterns the way spiders have.