The Yugopotamians already saw Poof in King Chang and the King and Queen also see him at the End of Wishology!, but they act like they've never seen him in this episode. Jorgen may have removed the events of Wishology! from the memories of the Yugopotamians around the end of Wishology!. Since they did see Poof in King Chang, they may have forgotten what he looked like since he did not look very important at the time they saw him.
When Timmy defeats all the Yugopotamians in the wrestling arena and then victorious stands on the pile of their bodies, when his fairies poof next to him the roof (which was previously intact) is inexplicably destroyed and remains that way for the rest of the episode.
After Timmy and Wanda fight, Timmy have several injuries like a damaged hat, a black eye, a hair burn, etc. But when he tells Poof that he have no time to play with him, his injuries are gone.
Also, some planks appear from nowhere before Timmy tells Poof that he have no time to play with him.
And Timmy's teeth changes places.
In Latin America, Blazing Burrito means "Burrito en llamas" that's not true as Blazing Burrito means "Burrito Flameante", not "Burrito en llamas".
Mark falling down stairs whenever someone hits him.
Cosmo getting inside a vacuum cleaner and sucking things that harm him.
The Queen showing Poof to make the people of Yugopotamia do what she wants them to do.