The pathologist acted more like an actor in front of a camera than someone who was cooperating in a photographic documentation session. The prosector used scissors like a tailor, not like a pathologist or surgeon. He held the scissors with thumb and forefinger, whereas pathologists and surgeons put the thumb in one scissors hole and the middle or ring finger in the other. The forefinger is used to steady the scissors further up toward the blades. The way the initial cuts in the skin were made a little too Hollywood-like, too gingerly, like operating on a living patient.
Autopsy cuts are deeper and faster.
I would expect the skin of a species with a jointed endoskeleton to be elastic, so it could move with and glide over moving joints. I cannot fathom that an alien who had external organs so much like ours could not have some sort of definitive structural organs internally. And again, the prosectors did not make any attempt to arrange the organs for demonstration to the camera. I'm sure an expert in lighting, cinematography, etc. This is a very basic piece of autopsy equipment, and all pathologists use it.