When Saxa and Fjor are fighting with knives, they switch from standard to false grip between shots.
It is not revealed exactly what class/ standard the students are in, but it is odd that Magne couldn't read or pronounce Cadmium. He intentionally speaks it to be some Kodym.
When the fight scene between Saxa and Fjor was happening and she was pinning him against the table the camera showed his arm on her shoulder and then it showed a different angle and his arm was bent and in front of him until the camera changed again and his arm had been back on her shoulder.
When the fight scene between Saxa and Fjor was happening and she was pinning him against the table the camera kept changing back and forth from being bent in front of him and holding her arm to being on her shoulder.