Continuity mistake: In this episode, the bottom of King Koopa's feet changes from green to yellow.
Revealing mistake: When Yoshi says the circus is more fun than tennis, a line on his underbelly is layered on his left arm. (00:04:17)
Audio problem: When Yoshi asks what doom is, his mouth moves before any sound comes out. (00:04:13)
Revealing mistake: When Mario and his friends reach Kastle Koopa, a railing is layered over Mario. (00:04:07)
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 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 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: 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)
Revealing mistake: When two cave kids enter the Warp Pipe, they move without moving their legs. (00:03:04)
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: When the Koopa Troop runs away, the green spikes on the orange dinosaur turn orange, like its body. (00:11:30)
Revealing mistake: After two of the cave people hammer in the crossing signals, one overlaps on a tree. (00:10:59)
Continuity mistake: Throughout its appearance, the colour of the Mega Mechanasaur's levers changes. (00:07:45 - 00:11:26)
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 Yoshi appears with a digging helmet, he has four spikes on his back instead of three. (00:10:27)
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)
Audio problem: When Ooga knocks on the door to Dome Castle, he knocks once, but the sound of knocking can be heard twice. (00:08:33)
