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Everybody who's a member of imdb pro can edit anything on imdb.com. Everybody can become an imdb pro member, you just have to pay a monthly or yearly fee. But nevertheless, imdb pro is also used by real movie professionals and what they do sometimes is to put in something (for example an actor for a role) to see how the reaction is on the comments or sometimes they put in a movie project that doesn't (yet) exist to see the reaction. To see the reaction to Super Mario Galaxy 3 on a movie site is a bit a stretch but it still could be testing.

For example, I can remember that once during production of the Tekken (2010) movie they put in Jackie Chan to play Lei Wulong just to get people exited and get more attention to the project. Because never on earth was Jackie Chan interested in playing this role.