Factual error: Whenever someone uses an iPhone (which is the phone of choice on CSI:NY), the screen stays lit when talking on the phone. The iPhone has a sensor which dims the screen when you put it to your ear, but only if you're actually making a call.
Deliberate mistake: Though the series title is technically inaccurate, since in New York CSIs are called CSUs (crime scene units), it's called "CSI: NY" to tie it in as existing in the same universe as its sister series "CSI: Crime Scene Investigation" and "CSI: Miami."
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.
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 ★