In the final scene when the money in the attaché case is handed over, the money is wrapped in bundles but when the case is split open on the carousel the money falls loosely to the floor.
In the pool hall scene, Joe and Fats are playing "three-cushion billiards," in which the cue ball must carom off both object balls and contact the rail cushions at least three times before the last object ball. However, Fats only touches two cushions on his 2nd and 25th points, which would be a loss of turn and no point scored.