After Howard throws water on Andy, the stains on Andy's shirt change when the camera cuts to a close-up.
When Andy empties out a broken jug of Otis' moonshine a brown liquid comes out. The prop department wanted to make sure the audience knew it wasn't just water. However, true brown liquor is either expensively aged in wood, or a pretentious affectation that moonshiners simply didn't bother with.