In the scene where agent Van Alden finds a congregation by the river while searching for a bootlegging operation, as he approaches the congregation one of the parishioners near the river is wearing Croc's. for shoes.
When Van Alden is baptizing Agent Sebso, we see in alternating shots that Sebso is wearing socks, and not wearing socks as he kicks his legs out of the water.
When Jimmy D puts his son into bed near the end you briefly see his bright blue and red modern underwear.