Just before the body of Sean (body #3) is set down on the ground he braces himself by putting down his feet. However earlier (or rather later) when he is being brought into the morgue he is stiff and has his legs curled up.
When Catherine goes to print the turtle, Mandy helps Catherine flip him over and his two front legs are waving madly but in the next shot, the turtle's legs are still.
A .22 pistol all-lead round is not a "high penetration round" and could not have traveled all the way up through an arm, and then take multiple paths around the inside of a torso. The energy is not there.
The ceramic ware displayed in one of the crime scenes is Greek (red figures), but it is mentioned as Mesopotamian (which, by the way, is a geographic reference not cultural).
During the interrogation scene, Brass & Gareth randomly mispronounce the Nevada town TOE-no-pah with Toe-NO-pah.
When Nick and Riley are examining one of the corpses, Nick spots a contact lens on his clothing. When Nick checks the eye of the corpse for a contact lens, the pupil dilates. Human eyes don't respond to light after death.