This episode is directed by Eriq La Salle. He played Dr. Peter Benton in another Chicago based series, ER (1994).
When investigators first question Bennett on his farm, he is standing in front of a small enclosure with at least five cows in it. A white cow is visible behind him, but it then disappears, and there are no cows behind him. When a wider shot is shown, the white cow is all the way on the other side of the other cows. The cow couldn't have moved past all the other cows that quickly.