Visible crew/equipment: When Sofia and Brass arrive at the interrogation room where Dwight is, you can see a red tape mark on the floor outside the door which Louise Lombard promptly glances down at and makes a point of placing her left foot on it. This has nothing to do with the fact that the "Hard Crime" film crew are following them because they're only observing.
Factual error: In a number of episodes people are shown eating and drinking in the laboratories. For instance, in "Miss Willows' Regrets" Nick and Greg are seen eating fried chicken in the lab, and in "Overload" Sara eats a sandwich while watching Grissom experiment with her deli pickle. There are other examples. No reputable laboratory (which this is supposed to be) would allow its staff to eat or drink while in the lab. It is basic scientific protocol to prevent contamination of samples or the person picking up toxins on their food.
[To a room full of dead corpses, after Holly Gribbs was frightended into hysterics.]
Gil Grissom: You assholes!
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Answer: He doesn't have the authority to arrest him - when anyone is arrested in the show, a police officer does it. Also he tells Ty that he is going to be submitting his case findings to Ty's insurance company, who would no doubt contact the IRS, who then would have him arrested for fraud etc.