Continuity mistake: This is a mistake for the introduction from seasons 2-20 (1991-2009). When Homer screams, he turns round. You see this in a wide shot. There are no boxes to the right of the door in the garage. However, two just appear out of thin air when he runs through the garage. (00:01:50)
Audio problem: When they are trying to escape Koopa and the little caveman speaks, then Luigi answers him, he has the Princess' voice.
The Ringer - S1-E1
Continuity mistake: Zelda has an amateur magician grow a large plant for her to use as a sling shot. He is standing beside Link as it grows and then suddenly disappears between shots. There was not enough time for him to have walked or run away. (00:11:40)
Onna no koi wa snesouyo! Kakutou shintaisou de iza shoubu - S1-E12
Other mistake: When Akane and Ranma arrive to Furinkan High, it's 8 past 20. When Kodachi leaves, it's 8:35. 15 minutes is way too long of a time to have passed (and everyone would also be late for lesson). (00:01:50 - 00:04:40)