As Liotta's character enters the hardware store at the beginning of the movie, the shield on his fire helmet has the titles "Captain" and "Arson" in inset leather panels (04:25). After he holds the child's neck (04:45), the camera pulls back and shows the titles printed on the helmet shield.
As Liotta's character walks through the burning store, to his left, a shelving unit "un-collapses (he's viewing it in reverse, so to speak). At 04:05, you can clearly see the wires attached to the front legs of the shelving unit to make it collapse when pulled.