E-I-E-I-(Annoyed Grunt) - S11-E5
Plot hole: When the Simpsons run away from the duel, they go to Homer's childhood farmhouse. But Homer and Grandpa burned the farmhouse down in the episode "Grandpa vs. Sexual Inadequacy".
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)
Plot hole: The Triforce of Wisdom is kept in Link's room up in a tower. It does seem logical to keep it with Hyrule's greatest hero to keep safe, but that's all you ever see protecting it. Hyrule is a large kingdom, and the Triforce of Wisdom is a vital part of keeping their community safe. Yet the only one protecting it is Link. And he's not with it 24/7. The room is not very secure either and is breached all the time by Ganon's forces. A kingdom like this would have knights to post all around the tower and be in Link's room when he's away. But nope, not here. (00:01:10)
Sukeban no me ni namida? Rûru muyou no kakutou shintaisou kecchaku - S1-E13
Plot hole: In the anime, Ranma commits an unsanctioned violation of the rules when she throws Kodachi out of the ring (the time when she gets saved from her schoolmates); she in fact grabs Kodachi's arms using legs and feet, and projects her. In the original manga there is no such mistake; Ranma used her feet to spin the club Kodachi was holding, so was not throwing Kodachi directly, but using the tool just as the rules say. (00:15:45)