During the fourth pitch, the curve ball, there were numerous football players practicing in the background. Fortunately, the "Extraction" visual effect blurred them, but they are still visible if you look carefully.
After the 2-2 pitch, when Denny is nearly hit, he falls face first on the ground. In the next shot, he is on his knees.
During the 1-2 pitch, a crowd of football players are visible for less than a second. These players are not present in any of the other shots.