Revealing mistake: In the shot looking across the four monks in the autopsy room, you can see the one closest to the camera taking a deep breath.
Revealing mistake: After Grissom finds Isabelle Millander dead in her chair, he walks towards the bathroom. When the shot changes, you can see her shift her legs even though she's supposed to be dead.
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.
Factual error: Sara calculates the time needed to sabotage the tire at a minute to a minute and a half. That is, remove the valve core, allow the majority of the air to escape (cannot pour anything into the tire while the air is escaping) pour in enough chloroform to sabotage the tire, replace the valve core, and air the tire to pressure. Even with an industrial air compressor, it would take over 2 minutes to air that tire to full pressure.
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.
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.
Cats in the Cradle... - S2-E20
Deliberate mistake: A father, daughter (both construction\demolition experts) and the boyfriend try to frame the husband for attempted murder by planting a pipe bomb in her (wife\daughter\girlfriend's) car. The bomb is a stick of dynamite inside a pipe with 2 endcaps on it. A pipe is used to hold a improvised munition together: i.e., homemade explosives, or something like Anfo. The pipe provides the casing for the explosive material. Or, it is used to keep the shrapnel fragments around the explosives (like nails or pellets around a stick of dynamite). For dynamite, you simply drill a hole (in rock, in concrete, in whatever.) and drop the stick in. It needs no extra casing. The family would have known that. But the CSI crew needed some evidence to analyze and the blasting cap + detonator circuit would have given them nothing to study. The endcap with the hole drilled for the blasting cap was the case solver.
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.
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: 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.
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.
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.
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.
And Then There Were None - S2-E9
Factual error: Ballistics expert Bobby Dawson mispronounces the word "Koch" in the term "Heckler and Koch". He pronounces it "kotch" instead of the correct, "koch" (rhyming with lock0. A ballistics expert would know the correct way.