There a scripture in john I believe where it's mentioned that the word Nails is used when describing Jesus hands being nails to a tree or stake or cross. One could easily argue that this plural use of the word means that Jesus hands were nails separately.
I also believe that it's been proven that if ones hands are placed above the head and then nailed to a stake the body would fall off. Not sure if this is true but it seams to make sense.