When Marcus uncovers Fanny's body, the dog's tongue is hanging out on the left side. After that, when Lucas is outside in the rain digging a grave, Fanny's tongue is hanging on the right side.
As Lucas is going back inside after going outside to see who threw a rock through the window, you can see the front door cracked open and light coming out. He had gone out through the side door.
When Marcus goes to see Bruun and they are in his kitchen, in one shot Bruun has a towel over his shoulder; in the next shot, he is shown actually putting the towel there.