In the final scene when Jeffries writes the word "CLOSED" on the lid of the case file box, in the first shot when he writes the the letter "L" it has a very distinct loop at the top and bottom of the letter. Then the camera cuts to a shot to show a close up of his face. When it pans back to show him finish writing the word "CLOSED", the letter "L" has no loops, indicating that the original lid was switched out for some reason.