Revealing mistake: When Mario jumps over the gap, his friends are briefly layered over him. (00:07:55)
Revealing mistake: When the Mario and Luigi in real life appear from the left side of the screen, the green or blue screen is not formatted properly, causing them to appear out of nowhere. (00:00:43)
Revealing mistake: When the camera pans across the front of Double Cross Ranch, the edge of an animation cel is visible. (00:13:51)
Revealing mistake: When a front view of King Koopa running down a street is shown, he clips through a building. (00:15:25)
Revealing mistake: When the camera scrolls to Grunt (in the scene where the gang are locked up in a cell, being watched a strong, non-human security guard named Grunt), he appears out of thin air. The animators might have had some trouble putting him into the scrolling shot. (00:11:15)
King Mario of Cramalot - S1-E2
Revealing mistake: When king Koopa says "I don't know. What?", his spikes disappear. (00:15:56)