When the detectives see activity on the blog, Lindsay says "I'll create a GUI interface using Visual Basic, see if I can get an IP address." Which sounds very high-tech but is, in fact, complete gibberish. Neither GUIs nor Visual Basic would be much use for tracking down IP addresses.
At the end of the show, New York streets are shown with the cars driving backwards. Reversed shot.
When the CSI's first find the Cabbie Killer, as he jumps from the high building onto the truck, it is an obvious stunt double, not the actor that plays the Cabbie Killer.
When the female victim "Claire"'s body is placed in the trunk, her eyes are open, despite being dead. As the camera pans away before the trunk is closed, her eyes move.