During the scene where Mario confronts King Koopa, in two shots, we see Luigi wearing red overalls and a red cap.
The parrot changes colors throughout the entire episode.
Bowser puts the red wand into a wall rack and picks the green wand. In the next shot of him, however, he is still using the red wand.
Bowser uses the green wand to transform his Koopa kids into giant ninja koopas. In the shot when Bowser points the wand to Prince Hugo, the wand is purple.
At Prince Hugo's castle, Big Mouth blows "Raccoon Mario", causing him to crash into a pipe and fall to the floor. When the Nipper plant comes out of the pipe, Mario's raccoon tail is white and red instead of black and brown.
In the shot of Bully running towards Mario and the Royal Parrot after the parrot complains about his cage, Bully is shown running on air and his feet aren't touching the floor.
After Bowser hits the block to bring up the warp pipe to escape from Prince Hugo after he's been transformed back to his regular self, his remaining Koopa kids follow him. When Kooky says "We're koopin out too!," Bully's lips are moving and not Kooky's.