Continuity mistake: When Hina is talking with Su-mi in the reception, she calls for a worker holding a tray of beer bottles. In the shot where the worker walks up to them, the bottle shown towards the right side of the tray is in a position where the label is facing towards Hina. When the camera changes angles, the bottle is now in a position where the label is facing the opposite direction. (00:55:53)
Continuity mistake: Whilst Hina and Leo are fencing together, the match ends with Hina pressing her sword against his chest. The sword can be seen bending when she does this, but when Leo starts saying "Whoa, whoa, whoa", the sword is at a straight angle. (01:01:51)