Plot hole: Jamie and his witness are in a patrol car when they are attacked by criminals in a van firing machine guns at them. Jamie (of course) chases them away after a prolonged firefight, and when the van is driving away we see another patrol car also shooting at the fleeing suspects. There didn't appear to be any cars with Jamie, nor did anyone come to his aid during the gunfight, and this other patrol car was facing the wrong direction.
Plot hole: Early in the show, Jamie is in a patrol car escorting a witness when they are attacked by several guys in a van. The side windows of their cruiser seem shatterproof and withstand many bullets, while the rear window is shattered immediately. NYPD cruisers do not have bulletproof windows.
Continuity mistake: After the accident, Baez has a scar on her left cheek. However, during the raid, the scar moves to her right cheek and back to her left cheek. (00:27:12 - 00:49:32)
Officer Down - S1-E4
Factual error: Danny and Jackie Curatola are with ESU to make an arrest at a garage. They are behind cover with their weapons drawn. Although there is no suspect shooting at them, both Danny and Jackie have their fingers on the trigger, which is against police training unless you are going to engage a subject by shooting your weapon. The ESU officer right next to them does not have his finger on the trigger. (00:38:04)
Other mistake: Danny, while driving home with his family, hits a man with his car. Danny gets out of the car to attend to the man, but his wife, Linda, who is a nurse, does not get out of the car to render aid to the man. (00:02:18)
On the Arm - S12-E11
Character mistake: Lt. Gormley mentions a Captain (Captain Terrell) taking items On the Arm that is a 33-year veteran. Captain Terrell tells the PC that when she was 12 her brother was wounded in Iraq. If she has 33 years on The Job, there's no way she could have been 12 during the war in Iraq. The Vietnam War would have been more appropriate for the age and background of Captain Terrell. (00:00:21 - 00:14:33)
Character mistake: In this episode, Garrett says that "Nom de Guere" means pen name. It means war name. Nom de Plume means pen name and Garrett is supposed to be an expert in his field.
Through the Looking Glass - S5-E19
Other mistake: Danny supposedly handcuffs an at-risk teenager. When the police officer takes her away to a cell, the girl isn't handcuffed. The handcuffs are just in her hands behind her back. (00:52:00)
Milestones - S9-E12
Continuity mistake: Jamie is arresting a subject after he drops a knife. Jamie kicks the knife away from the subject and it lands next to the brown box and under the red wording on the box. In the next frame, the knife is now just behind Jamie's right knee. (00:05:10)
Factual error: Danny shoots Frank's revolver, and as he continues to shoot, you hear the sound of a casing hitting the floor, which shouldn't happen since it's a revolver being fired. (00:11:46)
Friends in High Places - S10-E8
Continuity mistake: The Chinese food containers on Eddie and Jamie's table change positions, and the quantity of containers also changes. (00:18:08)
Continuity mistake: Near the episode's end, Danny gets into a shootout with Tommy in a house. The first two shots from Danny go into the wall. The next two shots, you don't see where they go as Danny runs to a different location. On Danny's next two shots, the wall doesn't have holes, and then two holes show up. With Danny out of bullets, he attacks Tommy from behind. When they wrestle, there are four holes now in the wall.
Mind Games - S9-E3
Continuity mistake: At the dinner table, after Edie plays her prank, the camera is opposite her. It's behind Danny and his sons. She sits down and puts asparagus on her plate. Two seconds later, the camera is now behind Pop. She picks up asparagus to put it on her plate, which is empty.
Continuity mistake: During the family meal, Jaime takes a bite of food, then immediately in the next shot, both arms are down, and he is talking and not chewing.
Continuity mistake: During the takedown at the apartment Danny is entering the building wearing hoodie and the shield around his neck, going upstairs, the next shot he is in shirt tie and vest at the staging area, then he is back in the apartment in the doorway in his hoodie, then he is in the street in vest and tie. (00:20:48 - 00:22:21)
Suggested correction: Danny is not one of the 4 men who follow Maria Baez inside and up the stairs (at 00:20:40). They are John Knight and his 3 men, all plainclothes with their shields hanging from necks. Earlier, right before Baez and the 4 men head out to the apartment, John Knight is standing near his 3 men inside the Clyde motorcycle shop (at 00:18:46 for example). Rewatch please.
Continuity mistake: Part way into the episode they show the front of Jamie's Ford police car and the car number on the front plate, but when they pull up to the court house to talk to his sister, it's a Chevrolet police car with a different number on the front. (00:09:05 - 00:09:40)
Continuity mistake: While Danny and Waylon Gates are with Rodriguez at the safe house, showing him the photograph of his daughters, during this scene there is no picture hanging on the wall beside the door, but as they lead Rodriguez out in the last shot of the scene, a picture suddenly appears on that wall. (00:37:30 - 00:39:20)
Visible crew/equipment: At the safe house, while Danny and Waylon are alone with Rodriguez they "convince" him to call off his men, and in the last shot of this scene as they head out the door, the reflection of a crew member (presumably the camera operator) becomes visible on the picture hanging beside the door. (00:39:20)
Character mistake: Eddie is confronted by Captain McNichols after being caught in her office. Eddie responds by calling her Sarge, which is an incorrect title remark referring to a Captain. (00:38:46)
Parenthood - S2-E14
Continuity mistake: Frank reaches for his cup of coffee twice and moves his foil-wrapped breakfast sandwich from sitting on top of a stack of blue folders on top of a newspaper. However, in the next scene, Frank reaches for the sandwich, and it is back on the stack of blue folders. (00:10:07)