When Roman instructs Vasiliy to turn off the camera and "save the battery for the shooting", a production car is briefly visible in the background.
During the engagement at the crossroad Vasiliy's weapon jams. This was an unscripted moment, and required actor Erik Vent to remain in character while he cleared the jam before continuing to fire.
During the ambush scene, Aleksandr's weapon jams as he stands up and moves.