Towards the end of the show, when Grady starts throwing furniture around his room, he tosses his dresser drawers from his left to his right. When the dresser lands you can see it from the back and see that there are no drawers in it - it is obviously a stage prop and not a real piece of furniture.
When Grady first tosses the bottle to the floor, we hear it break. Moments later it is shown on the floor intact.