Super Koopa - S1-E26
Revealing mistake: When King Koopa becomes Super Koopa for a second time, he remains in his normal form for a short time. (00:10:01)
The Adventures of Super Mario Bros. 3 (1990)
101 revealing mistakes in season 1 - chronological order
Starring: Walker Boone, Tony Rosato, Tracey Moore
Audio problem: When King Koopa says that he will be upstairs, his mouth is not moving. (00:05:42)