Greenlight - S1-E16
Factual error: Captain Anderson pulls a suspect underwater and shoots him. There's a bright, yellow flash under the water. In reality, this wouldn't happen, only a large amount of bubbles would appear, but no flash.
Revelations - S3-E6
Continuity mistake: When Tim puts Lucy in the squad car after "arresting" her, the rear door on the driver side is open, but when the camera pans back to her it's suddenly closed without making a sound.
Factual error: During the LAPD gun exchange program, an explosion happens from (according to the show) claymore mines being in the trunk of a car. In reality, this wouldn't happen as Claymore Mines are very stable and safe. The explosive used, C-4, is shock stable and temperature stable. The mine will only go off when used with a detonator.
Answer: This hardly seem to be an automatic center punch. Standard tool for technical rescue from car accidents.