Continuity mistake: When Jeff Clarke comes by the firehouse, Hermann wants to hug him but Clarke says "I don't really like people touching me." But throughout season 2 Clarke has hugged other fellow firefigthers (Cruz among others) with no problem.
Factual error: In the scene at O'Hara airport the paramedics meetup with a TSA officer. The TSA officer has a gun as a part of his uniform. TSA officers do not carry firearms. In addition, the CBP officer in the scene does not have on a proper CBP uniform. The CBP officer uniform has rank epaulets and officer has no epaulets, and the CBP uniform doesn't have a bar tie clip and the gun belt buckle is brass not stainless metal. (00:42:00)
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: Casey and Seagar run down the stairs leading to the parking garage. Seagar passes the 15th floor twice (large sign on the wall).
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)
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.
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.
Where the Collapse Started - S4-E22
Visible crew/equipment: After the paramedic locates the injured firefighter, the shot cuts to the outside and the camera operator's shoulder can be seen in the lower left of the shot.
Continuity mistake: While at the Firehouse and talking about Dawson getting Candidate EMT Tara "tanked", they have pancakes and sausage and as Otis sits, his sausage is on top of his pancakes and then when Casey walks up the sausage is cut up on the side. Then when it goes back to Otis the sausage reappears back on top of the pancakes, untouched. (00:28:28)
Other mistake: Captain Casey has Lieutenant pins on his uniform instead of Captain pins. (00:31:00)
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)
Revealing mistake: In the scene on the roof when Severide is removing the helicopter door with a spreader, there is no hydraulic pump or hoses attached, just the bare tool. When he sits the tool down you see this. So the spreader would not be working at all.
Character mistake: In the first call to a working structure fire Severide proceeded to head towards the basement from the middle level by walking down stairs but falls through. His first mistake was not checking the stairs with the halligan as any firefighter is taught, to check if they are sturdy. And last but definitely not least no firefighter should ever walk down stairs, especially wooden framed ones if they are on fire.
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.
Continuity mistake: One of the protesters approaches Chief Boden twice.
A Real Shot in the Arm - S8-E2
Continuity mistake: When Sylvie and her ex hometown friend are having milkshakes, both milkshakes keeps switching back and forth between full with whipped cream and a cherry (when Sylvie is in view) and partially full with melted whipped cream and no cherry visible (when her friend is in view). (00:20:00)
Continuity mistake: The entire fire house is in the hospital waiting room for word on Otis. Chief Boden sits down twice next to Casey.
No Such Thing as Bad Luck - S7-E18
Character mistake: At the formal awards ceremony for Cruz the Police officers and Cruz are in dress uniform with their covers on. Serveride joins them on stage in uniform without his cover on and salutes Cruz. Serveride should have known to have on his cover for the ceremony. (00:58:00)
Other mistake: In the pilot, Heather Darden states that Andy had been at the house for 14 years. Assuming that he was placed there directly after the Academy that would place his age at 32 years old at the time of his death (2012). In Season 3 (I Am the Apocalypse), April Sexton gives her year of birth as 1982, making her 33 years old in 2015. April and Andy both are said to be the same age as Kelly Severide, as Darden went to kindergarten with him and April sat next to them in class, however there is at least a 3 year age difference between Andy and April.
