When Carl takes Steve's place in the pool game at the end of the episode, the balls are placed differently when Carl says he'll take over to the point where he starts playing.
When Estelle takes the cue from Carl the 1 and 5 are near the cue ball. When she makes the shot the balls are gone.
In addition to the errors with the pool balls mentioned above, after Carl knocks the yellow striped ball into the pocket, it reappears on the table in the next shot.
It makes no sense that Boyd Higgins' goon knew that Eddie's sister Judy was headed for a D in English.