Continuity mistake: When Mario moves a curtain in the animated intro, there is no cavity in the shower, but in the next shot, one appears. (00:03:35)
Continuity mistake: When the magic carpet moves upward after Mario becomes Super Mario, Luigi's visor goes from green to skin colour and back to green.
Continuity mistake: When the limousine drives down the street, it has the US and USSR flags on the front of the limousine, but when water pushes it back, the flags change to generic red and yellow flags. (00:12:19)
Continuity mistake: When the crocodiles approach the general store, the store's front door has its doorknob on the left, but in the next shot, it appears on the right. (00:06:26)
Continuity mistake: When the ketchup lorry crosses the bridge, it has a cream cab and a red trailer, but in the next shot, it has a blue cab and a grey trailer.
The Koopas are Coming! The Koopas are Coming! - S1-E35
Continuity mistake: Just before the pillory is destroyed, it is violet, but in the next shot, it is orange. (00:14:37)
Continuity mistake: This mistake is in the intro with Mario and Luigi in real life. When Mario breaks the ceiling while Bowser is holding a yellow bar, Mario's gloves disappear from his hands when he jumps to break the ceiling. When he lands, his gloves reappear back on his hands. (00:00:26)
Mario meets Koop-Zilla - S1-E28
Continuity mistake: When Mario is eating sushi, he eats it with a fork, but his fork disappears and a spoon appears out of nowhere.
Mario meets Koop-Zilla - S1-E28
Continuity mistake: After when Luigi says "It's an earth shake!" when he flips, his straw hat changes into his green cap in mid-sentence. (00:03:58)
Robo Koopa - S1-E52
Continuity mistake: At one point, Mario asks Dr. Nerdnik how to stop Robo Koopa. The doctor walks in circles, and in the next shot, he is in a different position. (00:06:40)
