Continuity mistake: Casey and Seagar run down the stairs leading to the parking garage. Seagar passes the 15th floor twice (large sign on the wall).
Continuity mistake: One of the protesters approaches Chief Boden twice.
Continuity mistake: When Ritter pulls up to the overpass, the car's lights are on. They are off in the next shot when he exits the car and on again in the next shot as he walks away from it.
Escape Route - S9-E8
Continuity mistake: When Casey is in Molly's bar, Stella places a beer down in front of him. The level and amount of foam changes several times throughout the scene before Casey brings the glass to his lips.
Continuity mistake: Herman dumps coins on the map and as they explain how to use them, the spread of coins changes and there is a pile of coins that wasn't there before. (00:26:36)
Winterfest - S10-E9
Deliberate mistake: Even though it's supposed to be Christmas time, the trees are lush with green leaves, no breath is visible when the actors talk and in the background you can see people wearing shorts and T-shirts.
Winterfest - S10-E9
Factual error: There are trees full of green leaves, no visible breath from the actors and people in the background wearing shorts and T-shirts despite the story taking place at Christmas time.
Visible crew/equipment: A man trying to escape rams the front end of his smaller vehicle into the right front end of the ambulance, causing significant damage. But, there is no damage to the front end of the vehicle. It's visible in the scene that the smaller vehicle is on a ramp, so it's high enough to be able to crash into the right front fender and grill of the ambulance. (00:52:07)
