Right after Barcello made his huge three. First Tillie sets the screen on Seljaas and throws his arms out, putting Zac on the floor. Then after the pass is thrown back to Tillie he flails at Barcello sending him to the floor. Somehow the call goes against AB. This is when the items were apparently thrown on the court (couldn't see this on TV).
Nice closeup of TJ laughing after the call.