When Brackett is cutting the cast from the motorcyclist's leg, you can hear the saw running, but the blade isn't spinning.
During the radiation emergency while switching crews, the captain says " OK, take off you two. " but only one fireman walks away.
When the burglar trapped in the air conditioning vent speaks his voice sounds hollow, as if he is in a small echo chamber. As cramped as he is in the vent his voice should not have such a hollow sound.
During the air vent rescue, the fireman grab the K12 to cut the air vent open. When they show the close up of the fireman starting the K12, the pull cord is pulled, however the sound effect is of the saw being revved. Except the fireman is not touching the throttle.