At the start, when Paul Damon hits the man, he falls on his front. However, when his friend goes to pick the man up only a second or two later, he's lying on his back and is clearly not lying in the same spot where he fell.
Fr. Dowling pulls a book out of his pocket and says "I always carry my missal with me"; however, what he has in his hand is not a missal but a prayer book called Key of Heaven. Later when the book stops a bullet, he pulls it out and now it is a pocket sized New Testament.