Factual error: The CSI team determine a woman died after accidentally ingesting ricin (which she tried to use to kill someone else). She died within minutes of sticking her ricin covered pen into her mouth. According to the CDC, death by ingestion of ricin will occur within 36-72 hours (depending on potency, amount, etc.), not a matter of minutes. And, death could not have been from inhalation during her manufacturing of the ricin. They make it a point to show her burnt-looking tongue as the place where ricin was introduced to the body.

Continuity: When Grissom enters the cage in which the woman is found, he goes to the wastebasket to examine the pen that rolled on the floor. As he first picks it up, he grasps it right at the point where the black grip section meets the gray barrel section. As the shot changes and he continues bringing it up to examine it, he is now grasping it near the end of the gray barrel. As it is supposed to be a continuous shot (conversation is uninterrupted the entire time), there is no time for him to change his hand position.