Continuity mistake: When Lemmy falls down from the window and running away from Bowser with Iggy, Iggy's face turns orange. Then later, it turns back to green.
Continuity mistake: When Mario is about to reroute the lava, his sideburns disappear. In the same shot, his mouth moves before any dialogue comes out. (00:10:37)
Continuity mistake: When Yoshi spits out the Koopas, his lower jaw changes from white to green. (00:10:14)
Revealing mistake: When King Koopa tries to jump on the Koopalings, he is layered over a Block. (00:09:47)
Revealing mistake: When Hip and Hop run on a pipe, they and King Koopa are layered behind it. (00:09:41)
Continuity mistake: When Hop says that he and Hip are performing, even King Koopa would be proud of, his green shell turns white, while the white rim turns green. (00:09:12)
Continuity mistake: When the camera pans to Hip and Hop underground after Mario and his friends walk inside, Hop's green eyelids turn black like his glasses. (00:07:42)
Continuity mistake: When Hip pops the football, his bag disappears. (00:04:11)
Continuity mistake: After Oogtar gives Hip and Hop some gum, Yoshi's red saddle turns grey while the grey border turns red. This also happens when Oogtar applies fertilizer to his plant. (00:02:51 - 00:08:49)
