
Raiders of the Lost Mushroom - S1-E49
Continuity mistake: When Mouser wonders if the Lost Mushroom can make a castle out of cheese, his grey trousers turn white like his shirt, while Koopa Troopa's yellow eyes turn white. (00:13:07)

Raiders of the Lost Mushroom - S1-E49
Continuity mistake: Throughout its appearance, the Cobrat in the fishbowl has its eyes and underbelly changing colour several times. (00:08:11)
Other mistake: In the theme song, there's a part where Mario touches a star and gets fire power. The star is suppose to give hyper power, it's suppose to be a flower to give him fire power.
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)