Continuity mistake: When King Koopa tells Fryguy to prepare the Lava Machine, the white spikes on his tail turn orange. This also occurs when he approaches the boat. (00:10:06 - 00:14:50)
Revealing mistake: When Mario runs over to the Ostro, he can briefly be seen running in midair. (00:07:56)
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)
Koopenstein - S1-E21
Continuity mistake: In Mouser's first appearance, he does not have a laboratory coat on, but in the next shot, one appears. (00:03:46)
The Adventures of Sherlock Mario - S1-E18
Character mistake: When showing the sign for the Retro Router, it misspells router as "reuter". (00:08:11)
The Adventures of Sherlock Mario - S1-E18
Other mistake: When Professor Koopa-arity and his minions infiltrate the Tower of Victoria, a line appears on Professor Koopa-arity. (00:08:07)
Two Plumbers and a Baby - S1-E17
Continuity mistake: When Mario says that they have to free the children, his black sideburns turn red, like his cap. (00:06:43)
Two Plumbers and a Baby - S1-E17
Continuity mistake: Normally, the castle has a door, but when King Koopa says that the infants will have to do all of his chores, the door disappears. This also happens when Luigi is trying to listen in on what is happening inside the castle. (00:06:05 - 00:06:27)
Two Plumbers and a Baby - S1-E17
Audio problem: When Luigi says that the Princess is gone, he speaks through Toad's mouth, and shortly afterward, the fireflies freeze for a few seconds as the camera pans. (00:14:13)
Continuity mistake: After Princess Toadstool is captured by Blackbeard Koopa, the Koopa Troopa holding her left arm has a blue bandanna. But when Blackbeard Koopa says that she did not come willingly, the bandanna turns red. (00:07:53)
Continuity mistake: When Captain Clump says that Blackbeard Koopa bothers pirates, his purple trousers turn red. (00:07:59)
Continuity mistake: When the Mario Bros. are revealed, Mario is wearing the tank top of his disguise, but in the next shot, he is wearing his normal clothes. (00:15:18)
Continuity mistake: Normally, Blackbeard Koopa's ship is blue, but when Princess Toadstool is on his ship, it turns brown like Captain Clump's. This also happens when it is docked at his fortress. (00:08:29 - 00:11:17)
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)
Continuity mistake: When Butterfingers urges Princess Toadstool to stay, her leg bracelet disappears. This also happens when they run away from King Koopa. (00:12:14 - 00:14:34)
Continuity mistake: Throughout its appearance, the grey sideskirts on Mario and his friends' car turn brown like the rest of the car several times. (00:03:44 - 00:09:06)
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)
Continuity mistake: Throughout the episode, the white spikes on King Koopa's tail are coloured orange instead.