A seconds-long section of the video appears to show the first-ever known footage of Luigi in Super Mario 64 ... with checkerboard flooring, while a tall figure in a green shirt, green hat ...

So we had Mario and Luigi running around in that 3-D world, but we ended up not using it. Wired.com: Why did you decide not to use that Nintendo 64 game with Mario and Luigi? Miyamoto: Ultimately ...