Sam emerging from under the pool table with the 8 ball in his mouth after hearing Sumner tell Diane about her manuscript being accepted has several problems, even ignoring the impossibility of the ball becoming lodged in his mouth as a comedic gag. First, there is no way in the preceding shots out in the bar that Sam could have beat Sumner and Diane back to the pool room to hide without them seeing him, as the leave him at the front of the bar and he's never seen walking past before the go down the hall. Second, Diane throws the 8 ball into the corner pocket. The ball would have traveled to the ball-return slot, clearly visible in the shot, not under the table.