When the killer puts the gun to his head, we hear the sound of a revolver being cocked. In the next shot, we see the revolver in close-up with the hammer in the de-cocked position.
When Langston goes to see Craig in jail, the knife in Langston's hand changes position in between shots.
When Nick is talking to Harvey and Harvey yells at his wife, she crosses her arms but in the next shot, her arms are at her side.
When Sara discovers the bag with the dead crow, she refers to Ozzy Osbourne and Black Sabbath. Ozzy would never have said anything like that. That's a reference to Pelle Dead of Mayhem, which is possibly too obscure for the average CSI viewer.