In the one with the flashbacks, whenever Pheobe and Ross are in the bar and on the pool table...whenever Pheobe lays back there are 2 balls by her head, one on the right is orange and the one on the left is yellow, whenever they sit up the ball beside her I believe is orange instead of yellow, but then when the credits are about to run and they are getting off of the table both of the two balls are not there at all...