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.
Factual error: Johnny gets a personalized license plate that reads "cobrakai", which is 8 characters. California license plates only allow 7 characters.
Factual error: In many episodes showing "The Foosbox" from the outside, we see some tall skyscrapers from Downtown LA and then tall mountains just to the right of them, all in the background. However, the Foosbox is in Boyle Heights, and if looking towards Downtown (from Boyle Heights), there would not be any tall mountains in that direction, as presented on the show. The mountains are way further right than that, completely in another direction.