Continuity mistake: Shay is in the restroom at the firehouse after she returns from the horrible incident on their emergency call. She notices blood and human remains on her belt which she frantically rips off to clean the belt and her hands. In the next cut, while still at the sink washing her hands, the belt is back on.
Continuity mistake: Chief Boden is in his dress uniform and his award ribbons above his right pocket are hanging down. There is an emergency and he orders the firefighters to mount up to depart the firehouse. They all leave in a hurry, and when Chief Boden arrives on the scene his ribbons are no longer hanging from his jacket, but intact and straight above his right pocket.
Continuity mistake: Casey and Kelly are on the roof smoking cigars when a man runs up carrying his daughter yelling for help. Both Casey and Kelly put down their cigars and are next seen sliding down a ladder with black gloves on. They were not smoking cigars wearing gloves, and wouldn't have time to put them on to get off the roof as fast as they did.
Continuity mistake: When Brett and Dawson go rescue the two climbers, at the very beginning you can see a long shot of the group where the victim is lying with her legs and arms straight, while in the rest of the scene she lies there haphazardly in consequence of the fall.
Continuity mistake: When Dawson and the police detective are knocking the door of a suspect a neighbor is coming out to sidewalk and the snow is piled high along the sidewalk and parked cars. The next scene shows the ambulance and fire engine on the road with no trace of any snow.
Continuity mistake: When driving to their first call that shift (guy stuck between cars), Truck 81 is seen arriving at the scene while it should be still being repaired. When they arrive back at the firehouse, the truck they drive carries the number of the exchange truck they've got (E-..).
Continuity mistake: No snow in all exterior scenes except for when Chief Bowden pays a return visit to have dinner with the female resident of the building which was a fire scene early in the episode. He gets out of his car and walks to the building with several inches of snow on the ground. The immediate next scene of Shay (supposedly the same time) has spotlessly clean streets.