Visible crew/equipment: When Warrick is talking to Greg in the DNA lab comparing Brass's DNA, the boom mic is reflected on the back wall.
Visible crew/equipment: The prostitutes take turns telling their stories to Captain Brass in their dressing room. But as the long-haired brunette lady tells her story from a distance, you can see a cameraman in the mirror behind her waiting for his turn to film. When she is shown close up, you can see him closer in the mirror, filming.
Blood Drops - S1-E7
Visible crew/equipment: Near the start there is a visible mic boom just above Grissom's head to the left for a second. (00:03:23)
Cool Change - S1-E2
Visible crew/equipment: When Nicky is dragging her ex-boyfriend across the hotel room floor you can see green screens outside of the balcony doors and windows. (00:39:45)
The Finger - S2-E14
Visible crew/equipment: Nick goes into a house with a bird inside. As he enters the house, you can see a crew person (with a beard) in the reflection of the frame.
Visible crew/equipment: While Grissom is searching the car in the barn, a red laser light shows up on his left arm and dances briefly around the car for a couple seconds. This is caused by camera equipment in film. (00:26:25)
Visible crew/equipment: When David, Warrick and Catherine are standing in the crop circle discussing how the body ended up there, when David says "I have an idea", Warrick looks up slightly and you can see the boom mike reflected in his sunglasses.
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.
Visible crew/equipment: At the beginning during the robbery, you can see a boom operator in the glass when the woman grabs her son.
Visible crew/equipment: You can see the reflection of the filming car on Mickey Dunn's car just before he is arrested.
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.