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.
During Piney's song in the clubhouse, coach Joe is shown holding the deck of cards in his hand. The next cut shows him with all the cards spread out on the table. No time has passed since the song is marking the time.
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.