Continuity mistake: After Mario and Luigi pick up their weapons, they can still be seen on the ground. (00:11:39)
Continuity mistake: When Mario says that Karate Koopa is finished, he is not holding anything, but in the next shot, he has his staff. (00:15:41)
Continuity mistake: When Luigi swings his nunchucks a second time, his sideburns disappear. (00:12:40)
Continuity mistake: When Misaki says that fear never enters the vocabulary of someone training to be a martial arts expert, Mario and Luigi's gloves disappear. This also happens when Misaki says he will award them black belts. (00:06:24 - 00:16:23)