mount points and mount slots are different. think of mount slots like 'layers' for mounting images. using the mount slot is called when you do mountimage(imageName,2); (2 being the slot) you're limited to four slots (0,1,2, and 3). If you try and mount another image in the same slot, it will remove whatever image was in that slot already. The mount point is what you assign in the image datablock, it's basically the spot on the player it gets mounted to.
