Audio problem: Season 5, episode 18 "Point of No Return": When Hawkes is talking to Mac about the fibers he found, there's a brief shot of his silhouette in which his lips don't move while talking.
Green Piece - S5-E17
Audio problem: Season 5, episode 17 "Green Piece": When Stella is typing on the Apple keyboard she hardly lifts her fingers from the keys, yet we hear a loud clicking sound. That type of keyboard doesn't make that kind of sound, unless you pound the keys with great force. Also, the clicking sounds don't match up with her keystrokes.

Continuity mistake: When Flack, Lindsay, and Stella go to Kim Wey Imports, it's bright daylight out. But when Flack chases Wey out of the warehouse, the sky has suddenly become pitch black. They were only inside for a few minutes, so it shouldn't have been that dark. (00:25:05 - 00:26:30)
Revealing mistake: At the end of the episode, Jamie Sunderland receives a message from her father to not look back. The closeup on the phone's display shows that the phone is offline and it is visible that the message is in fact a wallpaper.
Continuity mistake: When they are cutting the tape from the woman found tied to a chair and shot, they cut the tape around her feet and remove then bag it, yet when they start cutting the tape on her hands a few seconds later the woman's feet are taped together again.
Audio problem: During the sequence where Lindsay is telling them about the tape with the lipstick on it, they show a man tying up a woman. You hear the sounds a woman would make if she was muffled by a gag (tape) on her mouth as she's being tied/struggling throughout the scene, but her mouth doesn't get taped until the end of the scene.
Continuity mistake: The first time Mac tests the cleaned up blood on the floor, it shows positive with Luminol. However in the flashback scene with Lindsay, the Luminol is not showing up.
Factual error: Season 5, episode 23 "Greater Good": A guy runs over a little girl in 2007. A flashback of the crime scene has Stella showing Mac a photo of the dead girl on a digital camera. The screen info shows 2009/3/25. Two years in the future?
Other mistake: When Mac is reviewing the fact that the suspect has been researching his background, it displays a US Military separation notice on screen. The word 'separation' is misspelled as seperation, in caps.
Audio problem: When Sid hands Mac the test tube with the metal splinter, Mac says "Looks metallic". There is a full frontal shot of Mac's face, and his mouth doesn't move.
Factual error: Lessing is said to have tried to enter the Marine Corps three times but failed the psych test; no psych tests are given when entering the Marine Corps.
Plot hole: At the end of the episode, Adam and Stella are checking how many others there are bearing the same name in a government database. "Stella Bonasera" gives one result, being the Bonasera character. A search for "Sid Hammerback" also gives one result, a 90 year old woman (the characters say it has to be his mother). But Sid himself should have shown up too, with the search yielding two results, not just one.
The Closer - S1-E22
Character mistake: In the morgue, Stella initially identifies Gilbert Novotny as "George Novotny", however, correctly identifies him later in the scene. He is referred to as Gilbert through remainder of episode.
Other mistake: Hawks is handed a pretty small container with some of the victims brains in it, and says there is about 50% of the brain still left out there to find. There is no way half of a brain is in that small container, it's not even filled all the way.
Revealing mistake: Through out the entire series anytime a body has a gunshot wound you can see that there is no actual hole, just makeup painted dark to look like it.
Other mistake: Danny & Hawkes see a customer list on a shopkeeper's computer. Computer issue: Not only can she print the list and bypass a print option popup window with a single keystroke (implausible), but there are no icons/links on the page for software to do anything with that list. As well, the window scrollbar shows that there are nearly two pages of content on that screen, yet it appears to be a single complete page for the camera. Technical issue: The list contains 27 customer names - but one is repeated (Ryan Jackson). Later in the episode, they cross-reference that customer list (then printed on an opaque board in Mac's office, with that same duplicated name), against a company's employee list on Lindsey's pad computer. She was "able to notice one last name in common," yet there are three last names on the employee list also on the customer list, and one of those last names has two people listed - so that's four people who could have connections, yet only one was checked.
Factual error: In the shot where Mac discovers Adam's details on the killer's desk, under Adam's name is what is supposed to be Adam's computer IP address. Although the first two octets 172.16 are a plausible address, within a private address range, the third octet is a little too high at 450 (the largest number in an octet is 255) and the fourth octet at over 1000, well.
Factual error: During their investigation, the CSIs learn that their murder suspect is in the witness protection program, under FBI protection. WITSEC falls under the jurisdiction of the United States Marshals Service, not the FBI. And considering how many protected witnesses the Marshals Service relocates each year, it's doubtful they would be shorthanded enough to need help from another agency to locate a missing witness.

Grand Master - S1-E4
Continuity mistake: When Hawkes shows Mac the rib he is molding, he picks up a towel to dry it off. In the following shot, the towel is on top of the microwave, and Hawkes picks it up a second time. (00:26:10)
Other mistake: When Adam shows Mac how Suspect X finds her clients online, Mac comments that he's thinking of phishing scams, but in the closed captions, the word is mistakenly spelled "fishing."
Chosen answer: Probably to broaden the scope of the show's plot and give the audience a chance to see the characters in a different setting, People act differently at home from the way they do at their workplace. By the ninth season, the characters would have become overly familiar and predictable. It gives the writers a chance to do something different with them.
raywest ★