This is not a bug, but a problem. People have been modding the exclusive Super Mario Mash-Up Pack for Pocket Edition. I think people have been modding it on PlayStation and Xbox as well, but people have been uploading this on YouTube. Mario belongs to Nintendo. 4JStudios haven't looked into it yet (I don't think so) but this isn't right. Videos will receive copyright complaints and I don't want that. Nintendo and people using their property doesn't end well. So I'm trying to help. Please read!
This is an issue with third party modifications and will not be reviewed on this bugtracker.