Continuity mistake: When Toad explains that King Koopa and his minions are cutting down the tree, his vest disappears. In the same shot, he speaks through King Koopa's mouth. (00:14:42)
Audio problem: When Luigi says that Mario's wrench will bring his memory back, his mouth does not move. (00:13:59)
Revealing mistake: When the female monkey grabs Marzan, he appears out of thin air. (00:08:35)
Continuity mistake: When Marzan fights a lion, his clothes are ripped, but when he falls with the female monkey, his clothes are intact. This also happens when he saves his friends. (00:08:16 - 00:10:41)
Continuity mistake: In several shots, the white spikes on King Koopa's tail turn orange.
Factual error: When water starts flooding Brooklyn, the water floods the main road but never floods the side roads. (00:12:21)
Continuity mistake: When the President's car drives up to the Mario Bros, it has the US flag on the left of the car, but in the next shot, it is on the right of the car. (00:12:02)
Continuity mistake: When the construction workers walk over to Sergeant Kooperman, the one with a yellow shirt has mud on his shirt, but in the next shot, the mud disappears. (00:11:42)
Revealing mistake: When Sergeant Kooperman stops at the fire escape, he moves without moving his legs. (00:06:35)
Revealing mistake: After Mario retrieves his Plumber's Helper, he is briefly layered over Princess Toadstool. (00:16:26)
Revealing mistake: When the clogs splash on Sergeant Kooperman's face, the one from Mario's sink appears out of thin air. (00:07:50)
Audio problem: When Mario says, "Who cares?", he speaks with Luigi's voice. This also happens when he is surprised by the amount of time Sergeant Kooperman gives him and Luigi to unclog the sink. (00:05:19 - 00:07:41)
Mario and the Red Baron Koopa - S1-E30
Audio problem: In several shots during the beginning of the episode, King Koopa's mouth moves but no sound can be heard. (00:05:27 - 00:06:17)
Hooded Robin and His Mario Men - S1-E25
Continuity mistake: When King Koopa asks Hooded Robin, "How does it feel to be in his dungeon?", the spikes on his shackles disappear. (00:08:41)
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)
Elvis Lives - S1-E39
Continuity mistake: When Luigi inflates one of the tyres on their car, he is by the car, but when the tyre explodes, he disappears. (00:12:20)
Elvis Lives - S1-E39
Continuity mistake: When Princess Toadstool says that Kool Koopa has trouble, Kool Koopa's red car turns green. (00:12:52)
Elvis Lives - S1-E39
Continuity mistake: When the shoes say that Elvin will be unfrozen if Princess Toadstool puts them on him, Elvin's brown socks turn blue like the shoes. (00:08:51)
Elvis Lives - S1-E39
Revealing mistake: When Kool Koopa tells the Goombas to get Mario and his friends, a building overlaps one of the Goombas. (00:05:17)
Revealing mistake: After Alley Koop orders his army to attack, he is briefly layered over a Koopa Troopa. (00:04:01)
