When Alma brings Boyka a glass full of clear water, it magically turns into something red, like grape juice or prune juice, when he drinks it. Also the glass is instantly just half full.
Boyka is an Orthodox Christian but he is crossing himself in the Catholic way.
Both the injury to the corner of Boyka's mouth and the cross on his neck are on his left side in one scene. A few scene later, they are both on his right side.