Continuity mistake: After Luigi asks how many more wheels he and Mario have to make, his black mustache turns the same color as his skin. (00:02:26)
Continuity mistake: When Luigi and Yoshi start fighting over the stick, the black "L" on Luigi's cap turns green. (00:03:57)
Continuity mistake: When the Mega Mechanasaur starts breaking into Dome City, its dark-blue shoulders turn light blue. In the same shot, the cover underneath it disappears. (00:07:37)
Continuity mistake: Throughout its appearance, the colour of the Mega Mechanasaur's levers changes. (00:07:45 - 00:11:26)
Continuity mistake: When King Koopa and Kooky board the Mega Mechanasaur, the brown borders around the cockpit turn blue. (00:07:48)
Continuity mistake: When Mario and Luigi are in the lava pit, the pizza Luigi is cooking changes direction between shots. (00:08:52 - 00:09:22)
Continuity mistake: When Luigi asks Mario about the message, Princess Toadstool is sending, Mario's blue shirt turns red, while the stripes on his and Luigi's gloves turn the same color as their shirts. In the same shot, Luigi's mouth initially is not moving when he speaks. (00:09:11)
Continuity mistake: When Yoshi appears with a digging helmet, he has four spikes on his back instead of three. (00:10:27)
Continuity mistake: When Mario, his friends, and the cave people are ready to fight the Mega Mechanasaur, the machine's lower jaw changes from yellow to blue. (00:10:40)
Continuity mistake: When the Koopa Troop runs away, the green spikes on the orange dinosaur turn orange, like its body. (00:11:30)
Continuity mistake: At the beginning of the episode, the circus for Dome City can be seen, even though Mario and his friends have not hosted it yet. (00:01:30)
Continuity mistake: The score for the tennis match can be 30-love before Luigi announces it. (00:01:35)
Continuity mistake: When Luigi explains that ball boys pick up balls instead of eating them, the number of fingers he has on each hand changes from five to four. This also happens when Mario says they should check out the circus, along with Mario. (00:02:02 - 00:04:22)
Continuity mistake: When Kootie Pie is putting up a poster, her cream snout turns orange like her body. (00:02:09)
Continuity mistake: When King Koopa is first seen in a Koopa Clown Car, the rim around it is white, but in the next shot, it is green. (00:02:45)
Continuity mistake: When King Koopa says, "The cave people will become food for his dinosaurs," his cream claws turn yellow like the spikes on his shackles. (00:03:03)
Continuity mistake: When Mario goes out of bounds to hit the ball, he is briefly layered behind Yoshi. In the same shot, the white stripes on his gloves turn blue like his shirt. (00:03:16)
Continuity mistake: When Mario falls into the cage, King Koopa disappears. (00:07:29)
Continuity mistake: When Princess Toadstool throws the Fire Flower to Mario, the underground is depicted at ground level. (00:08:34)
Continuity mistake: When Mario rips the tent, the lock on the cage faces away from it, but in the next shot, it faces towards it. When Luigi, Yoshi, and the cave people cheer for Mario, the lock returns to its original orientation. (00:10:12)
