I think it's more like "if the camera zooms in on it or otherwise draws attention to it". If everyone leaves the room and the camera zooms in on a piece of fur

I think it's more like "if the camera zooms in on it or otherwise draws attention to it". If everyone leaves the room and the camera zooms in on a piece of furniture then you would expect that piece of furniture to have some sort of importance or role to play later. If, as a character is leaving a room, a piece of trash falls out of their pocket and the camera focuses on that piece of trash then you expect that detail to be important to the plot later.