Petra spots a foreign object inside the body. She says it looks like a bone fragment. The object is found on the underside of a rib and when the object, a fingernail, is removed and observed, it is tiny. If this tiny fingernail had been on the underside of a rib it would have been almost impossible to detect.
The bullet shown is a FMJ (Full metal jacket) for military use. In game hunting hunters use almost only JHP (Hollow point) or JSP (soft point) both recognized easily because the tip is of lead for max stopping power.
Henry develops the photograph in the darkroom with a light on but colour processing requires complete darkness.
When the boat leaves Carrie and her father on the pier the sound of a diesel engine changing gears can be heard.