Revealing mistake: When the Mario and Luigi in real life appear from the left side of the screen, the green or blue screen is not formatted properly, causing them to appear out of nowhere. (00:00:43)
Revealing mistake: In many episodes, when the outside of Mario and Luigi's business is shown, the edge of the backdrop can be seen.
Revealing mistake: When Mario jumps over the gap, his friends are briefly layered over him. (00:07:55)
Revealing mistake: When Toad notices Cheepy, Cheepy's eyes are mostly closed. (00:14:52)
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)
King Mario of Cramalot - S1-E2
Revealing mistake: When king Koopa says "I don't know. What?", his spikes disappear. (00:15:56)
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: 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)
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)
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)
Revealing mistake: When Princess Toadstool spots King Koopa, King Koopa and his minions are layered over a wall. (00:07:14)
Revealing mistake: When Mario tells Toad to grab him, Toad is not fully drawn. (00:04:27)
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 shoots fireballs at Koopa Khan and his army, a fire is layered over a Snifit. (00:12:48)
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: In the live-action segment, when E.C. arrives, the basement shakes but the objects remain stationary, revealing that the shaking was achieved by shaking the camera. (00:02:10)
Two Plumbers and a Baby - S1-E17
Revealing mistake: When Mario and Luigi look at what King Koopa is doing with the infants in the castle, one of the infants is laid out of the castle instead of inside it, and shortly after, a tricycle is laid over another tricycle. (00:06:31)
Revealing mistake: In the live-action segment, when the Super Plant chases Mario and Luigi, the actor's shoes can be seen. This also happens when the Super Plant heads over to Dr. Toby. (00:17:43 - 00:18:57)
Revealing mistake: When the ceiling begins to collapse, some of the debris freezes in midair. (00:08:52)
Revealing mistake: When the debris covers the trapdoor, some debris from behind it overlaps the debris on it. (00:09:13)
