During a rainstorm, the grounds crew is shown pulling the tarp over the field. After a locker room scene, the next exterior shot shows only the home plate area covered, and the rest of the field open to the rain.
During a game against the Orioles (right after the taunt "Get a job, Wiggin, get a job!"), an overhead shot shows no base-runners. Henry pitches, the batter hits the ball; then the next shot, from the hitter's point of view, shows a runner starting off from second base.
Paul shoots the light in the hotel room using a single action revolver, which requires manually cocking the hammer. However, the hammer is clearly in the down position and his finger is not even on the trigger.