7th Oct 2011
Dead Ringer - S4-E20
Revealing mistake: At the beginning of the episode, when Grissom notices the body and pulls over, in the close up of him you can see that the steering wheel never moves: he just moves his hand to make it look like he's pulling over.
4th Sep 2011
Revealing mistake: When Bobby Diaz gets shot by Glenn McIntyre at the end of the episode, it causes him to fire his Beretta at the jetty he's standing on. Despite being at very close range, the deck remains unaffected by the gun shooting it. He also lacks any gunshot wounds.