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)
Continuity mistake: When Mario sees Princess Toadstool in the Koopa Clown Car, his white gloves turn the same colour as his skin. (00:10:18)
Continuity mistake: When Mario jumps on a Mechkoopa, his black eyebrows turn brown. (00:10:26)
Continuity mistake: When Luigi, Yoshi, and the cave people cheer for Mario after he saves Princess Toadstool, the white stripes on Yoshi's tail turn green. (00:10:51)
Continuity mistake: When Luigi is giving some ice cream, his white gloves turn the same color as his skin, while the stripes turn the same color as his shirt. (00:11:08)
Continuity mistake: In this episode, the bottom of King Koopa's feet changes from green to yellow.
Continuity mistake: When a downward view is shown of Luigi and Princess Toadstool holding onto the stands, the wristbands on Luigi's gloves go from white to blue.
