King Mario of Cramalot - S1-E2
Plot hole: When Mario and his friends are in the dungeon, Mervin is not present. If he had his wand, he could have teleported them away from King Koopa when they were surrounded by his minions. If he did not, he would have been captured with them. Either Mario and his friends should not be in the dungeon, or Mervin should be. (00:10:00)
Robo Koopa - S1-E52
Plot hole: Near the end, Robo Koopa sets down Dr. Nerdnik after he had just captured and held him hostage. Why would he do that? (00:11:55)