Pretty much like the title says. I was in the Verizon store and got a nice ugly orange hard case for it, and we had trouble clipping the piece on the front. We tried it on the demo and it wouldn't work. No big deal..just a bad mold, it happens.
I decide to plop it down and get an Otterbox. Same deal. Tried that one on the demo, and it fit. We go back and open a couple more and try them, same deal.
The orange one was defective, but the others were not and fit the demo as well as his own personal phone.
Our only assumption can be that there is something wrong with the molding on my Droid, not allowing anything to clip on.