Other mistake: During the shout at the beginning, when the workman is hanging dangerously close over the electricity transformer, Nick is informed by the electricity board that they cannot get closer than 15 feet without it arcing. So why isn't the transformer arcing when the workman is hanging just under a foot from it?
Continuity mistake: When Billy and Sicknote go upstairs after their encounter with Pitbull, they go upstairs to change into uniform. The camera follows them upstairs. The appliance bay has no other firefighters present. When the camera pans back down, a full roll-call is taking place in the appliance bay, including Billy and Sicknote who just went upstairs to change few seconds earlier. This was probably done intentionally but it sure does look ridiculous.