Sneaky Lying Cheating Giant Ninja Koopas - S1-E2
Other mistake: When Cheatsy and Kooky suggest the kingdoms the Koopalings should take over next, their nostrils disappear. (00:08:18)
Sneaky Lying Cheating Giant Ninja Koopas - S1-E2
Other mistake: When Princess Toadstool changes Mario back to normal, Mario's cap can be seen before he transforms. (00:10:42)