Revealing mistake: When Mario climbs out of the pit, he passes through Toad. (00:07:28)
Revealing mistake: When the debris covers the trapdoor, some debris from behind it overlaps the debris on it. (00:09:13)
Revealing mistake: When the ceiling begins to collapse, some of the debris freezes in midair. (00:08:52)
Revealing mistake: When King Koopa tells Dr. Sheldon to make a potion that will stop Princess Toadstool, he is briefly layered between a podium and a bag. (00:12:28)
Revealing mistake: When Mario and his friends start running to the drainpipe, Drainotto runs in place for a few frames. In the same shot, Toad briefly runs in midair, and shortly after, he is layered underneath a rock. (00:13:18)
Revealing mistake: When Mario shoots fireballs at Koopa Khan and his army, a fire is layered over a Snifit. (00:12:48)
Revealing mistake: When Mario tells Toad to grab him, Toad is not fully drawn. (00:04:27)
Revealing mistake: When Princess Toadstool spots King Koopa, King Koopa and his minions are layered over a wall. (00:07:14)
Love 'Em and Leave 'Em - S1-E8
Revealing mistake: After Luigi pours the love potion, Mario's arms are missing for a few frames. (00:15:45)
Love 'Em and Leave 'Em - S1-E8
Revealing mistake: When Mario and his friends are running through the maze, his friends are briefly layered over some bushes. (00:06:34)
Mario meets Koop-Zilla - S1-E28
Revealing mistake: In the live action segment, when Madam AGoGo begins reading the Bros' fortune, a lightbulb can be seen making the crystal ball glow. (00:17:25)
Revealing mistake: When Mario and his friends laugh at the end of the episode, Mario appears to be standing in midair. (00:16:54)
Revealing mistake: When Karate Koopa catches Princess Toadstool and Toad trying to escape, his legs and part of Princess Toadstool's dress are cut off for a few frames. (00:13:49)
Revealing mistake: When Mario and his friends kick the Ninjis when being surrounded by them, one freezes in midair while another duplicates itself. (00:12:48)
Revealing mistake: When Misaki says he cannot break the chains, his air bubbles occasionally freeze. (00:09:45)
Mario meets Koop-Zilla - S1-E28
Revealing mistake: When Mario says that the Super Sushi makes for great spaghetti sauce, his visor is layered in front of his head. (00:03:44)
Revealing mistake: When Toad is disguising the car, the dust freezes for a few seconds. This also happens when King Koopa sucks it up. (00:11:48 - 00:13:19)
Revealing mistake: When the guard pokes Toad with his spear, it does not touch Toad, but he reacts as though it did. (00:05:25)
Revealing mistake: In the live action segment, when the smoke billows from the furnace, it appears to be sprayed from a hose. (00:18:06)
Revealing mistake: When Toad notices Cheepy, Cheepy's eyes are mostly closed. (00:14:52)