Continuity mistake: When Nick is staring intently at the doctors lapel area, the camera zooms in and we see some lint on the doctors left lapel. When Nick asks Catherine to get the tape on it, Catherine approaches the suspect and she starts to put the tape on the left lapel, but when the camera zooms in for a close-up of her getting the lint, the tape is being applied to the RIGHT lapel.
Continuity mistake: Nick is eating a hot dog when he's handed a warrant. Depending on the camera angle, he goes from taking a bite out of the hot dog to holding the hot dog in one hand and the warrant in the other simply with camera angle changes.
Continuity mistake: In the scene where Nick and Catherine are interviewing Walden, Catherine's fringe moves from right to left and back to right. This continues throughout the interview.
Continuity mistake: 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.
Continuity mistake: When Warrick is talking to Dr. Robins, his collar changes place. During the close-ups, only the right side of his collar is tucked in. During shots farther away, both sides are tucked in.
Continuity mistake: When Brass is searching for Ellie's car on his in-car computer, it identifies it as a 1976 Camaro, however when he spots it and calls for back up, he says it's a '78 Camaro. Additionally, the licence plate is also different to what was listed on the computer.
Continuity mistake: Supposedly, Paul Millander was 10 years old when his father was killed. A newspaper report read by Sara in 1x08(Time 39:45) says this. It also says that his father died August 17th, 1959. In 2x13(Time 43:18), in the last scene, Grissom looks at Paul's birth certificate. It says that Paul was born August 17th, 1956, which would mean that he was actually 3 years old when his father died. (00:39:45 - 00:43:15)
The Finger - S2-E14
Continuity mistake: When Catherine goes into the diner with a man and Sarah is sitting talking to her date, in one shot they are talking and in the next immediate shot he has a cup to his lips.
Continuity mistake: Stephanie Watson's supposed killer is, on the TV, named as Mark Kelso, but later when Catherine is going over the DNA sample with Greg, it is a match to a Dwight Kelso - supposedly the same person.
Continuity mistake: When Sara is waiting with Greg for the results for what was inside the tyre that exploded, she grabs the paper straight off the printer, reads it, looks at Greg and takes off immediately to inform Gil. When Grissom looks at the paper, you can see Greg's name is signed at the bottom as confirmation, but he never got anywhere near the paper.
Continuity mistake: The Camaro at the crash scene is a late second generation model (built from 1970 - 1981), however in the flashbacks to the crash it's a third generation car (82 - 92). The difference in body styles is quite pronounced.
Cats in the Cradle... - S2-E20
Continuity mistake: Marcie Tobin's BMW 7 Series changes from a newer (at the time) E38 model to the first generation E23 when it explodes. Obviously the production couldn't afford to blow up a brand new car so the older model was substituted.
Continuity mistake: When Catherine walks up the stairs, Horatio Caine aims his gun upwards. In the next shot he has his arms down. (00:36:10)
Continuity mistake: In this episode, Catherine is sent to Miami on a lead of a missing child. There they find a car in a swamp, and when the pull the car out and open the door, a female body falls halfway out. When this happens you can see the woman playing the victim breathing. You see her stomach moving up and down.
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.