Animation - At 1:27, a blue line flashes across the top of the screen.
Model - At 2:05, Sky Lark can be spotted behind Cardin Winchester wearing his armor. At 2:42, the same character sprite is shown in uniform.
Model - In a previous shot a blacked-out character is seen taking notes. At 2:05, the character is gone but the pencil remains in note-taking position. At 2:42, when Sky can be seen in uniform, the blacked-out character has returned.
Animation - When Jaune Arc is struggling to answer the question, Bartholomew Oobleck is standing in front of him. The next scene pictures the other students behind Oobleck thus placing the teacher next to Jaune which is impossible considering each desk is next to the other.