Factual error: While talking with the gang leader alone, Bradford declares, "I'm never alone," and suddenly a swarm of officers descend on them, and a helicopter appears directly overhead. The helicopter makes no noise until the spotlight is turned on. A helicopter makes deafening noise and can be heard from miles away. There's no way you could be surprised by one being directly above you.
Continuity mistake: When Angela is eating a pickle with Marshmallow fluff, there is only one more bite of pickle left. However, when the camera turns, she has a whole pickle again. (00:05:15)
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.
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.
Continuity mistake: In the episodes before "La Fiera," Nolan's new truck is a black Toyota Tundra. However, after that episode, it changes to a Nissan Titan, yet his character still says, "black Toyota Tundra."
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.