Whilst Bosch is hiding in the truck, the driver gets out and the interior light comes on. When Bosch opens the door, the light doesn't come on.
The sister says Dominick went to basic training at Camp Pendleton. Dominick was a sailor, not a marine and the Camp Pendleton never trained Navy recruits there.
Dominick is constantly referred to as a "medic". Medical personal in the US Navy are called Corpsmen.
Harry Bosch asks if a deceased character were drafted into the [US] Navy. Fact is, the US Navy never accepted draftees during the Vietnam War era.
Dominick's sister gives Bosch an envelope and says that she wasn't sure about showing him the pictures. Bosch takes out one picture, looks at it, and puts it away without looking at any others.