The claw-like hands are one millimeter thick, but the arms are two millimeters thick. The delta is not a trivial detail. Changes in thickness can lead to defects in plastics. Here, there are 600 micron voids inside of the arms.
On the exterior, the surfaces are clean and square. The torso is the exception, where there are intentionally large angles. Interior surfaces are where the designers hide the draft angles required to release parts from a mold.
Computed tomography picks up both geometric and material information. Seeing the reflective fire vest separate from the body indicates it has thickness. The color change of the vest relative to the body implies a dissimilar material in the coating.
The torso has two planes of symmetry that form an axis in the Minifigure's neck. This makes the neck a lovely place for a gate — the site where plastic is injected. Interesting, then, the placement of a LEGO logo here. Only the L and O are defect-free due to the gate. Can you find another example of this in the scan?
Ignore the voids, and focus on the legs. It is worth driving around this part of the scan to notice how precisely the legs interact with the torso. See the use of flexural walls. These walls ensure the legs are held with pressure even when there are size variations.