Revealing: Season 5 Episode 18 "Spark of Life": when they show a closeup of the badly-burned woman during her debridement, it can be seen that even though her eyebrows and hair and, in fact, 90% of her skin has been burned away, she still has long, full eyelashes.

Other: In the scene where Grissom is talking to the coroner about the man who was shot and strangled with his tie, you can see the actor that played the body breathing.

Continuity: In episode "The good, the Bad and the Dominatrix" When Sara takes the photos of Lady Heather's neck bruising you see 2 distinct ligature marks. When Brass serves her with the search warrant you can see only the remnants of one ligature mark then when she is in Brass' office later she again has 2 ligature marks.

Deliberate "mistake": Every time the investigators deal with IP-addresses, the addresses on display are impossible. Each of the four parts of an IP-address has to be between 0 and 255. As they do have to use IP-addresses some time, they could use addresses starting with 10. Those would be real addresses although not used as an official IP-address. This isn't the same as phone numbers using 555 - any IP address over 255 just wouldn't work. It would be like mentioning a phone number which uses the symbol for pi.

Audio problem: In one scene, when Warrick is in the prints lab, Nick claps his hands twice, but the sound track has him clapping three times.

Continuity: Series 7 - Part 1: When Sara and Warrick are at the table discussing the case, Sara's box containing her veggie sandwich changes position depending on whether the camera is looking at her or Warrick. (It moves from directly in front of Sara, and then several inches to her right toward the edge of the table).

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.

Factual error: Grissom and Catherine are looking through a microscope and discussing a microscopic specimen (heart of frozen body). In reality they would not see anything as all microscope objectives are missing on this instrument (the microscope nose-piece is totally empty.).

Continuity: In episode 8-1 Dead Doll: When Warick finds the zip-tie in the trunk it is not looped, when he holds it up for Grissom it is looped. He would not have looped it himself.

Other: In episode "The Good, the Bad and the Dominatrix" When the son goes to the bank he tells the manager that there was a million dollars in that account last week, there was 843,508.00 taken out leaving a balance of 31,053.86. That only adds up to 874,561.86. Not a million dollars. He doesn't say close to a million dollars He says there was a million dollars in that account.

Plot hole: A large part of Nick's plotline revolves around the discovery that the couple's stolen ring has a fake diamond switched out for the real one. But the ring was left as collateral for a very expensive necklace for the woman to wear that night. There is no way that a jewelery store would accept a ring for collateral without appraising the ring's/stone's value first. And in that inspection, they would have discovered the switch and not accepted it.

Plot hole: In the scene where Lindsay is being questioned she says that the car driver got out of the car, then Eddie (Lindsay's father and Catherine's Ex) fell out of the car and into the water. This is not possible. The passenger side door was closed and as the car was on an angle and wedged against the ground and unable to open. It is not possible that he fell upwards and out of the driver side door.

Continuity: In the scene where the CSIs are first crawling into the nursery, you can see Grissom's ungloved hand, which was gloved before entering and after exiting the crawlspace.

Factual error: As has been noted, the problem with pressure differentials will make it impossible to flood someone's room with CO2 from sublimating dry ice anyway, but there is another problem. Dry ice sublimates at -78.5 C. That gas is going to be very, very cold and it will rapidly bring the temperature of the room down to a very uncomfortable level. Before a sleeping person suffocates they would be woken by the freezing cold.

Factual error: The show falls into the Hollywood myth on polygraphs. Jesse is given a polygraph test after pleading guilty to the 4 murders. He answers all questions, except the last one, honestly. The 4 traces on the polygraph show no real movement on these questions. On the final question, Jesse lies and all 4 traces spike. If polygraphs actually did that, they would be admissible in court. But the reality is, it is the opinion of a highly trained operator that decides if there is a lie. The average person could not look at a polygraph results and point out a lie. There is no huge, visible spike. The producers could have replaced the 4 traces with a red\green light: Green is an honest answer and red a lie.

Visible crew/equipment: Season 6 - "Bang-Bang": when Captain Brass is shot you can see the squib light appear on his right side just before the "bullet hole" in his shirt.

Continuity: While Sara is looking through missing person's files, Grissom comes in and starts talking to her. One shot her hair is in front of her face, the next it's behind her ear. This continues throughout the scene.

Revealing: When the CSI from Miami and Catherine are in the autopsy, the guy goes to take a sample from the eyes of the dead woman. When he moves the swab towards her eye, you can see the actress' top eyelid move instinctively. She's supposed to have been dead for hours.

Factual error: In the episode where the worker got electrocuted in a construction site the main character, before replaying the victim's fall, says that "terminal velocity is 9.8 seconds squared". What he should have said was that acceleration due to gravity is 9.8 meters per second squared.