Never thought twice about the black buttons on the unit used in the commercial. They're from the first run of NES units from 1985. I can only surmise that just a small percentage of NES units sold had the black buttons since the design was changed soon after (in the February 1986 nationwide release, the console had the typical gray buttons), and the vast majority of people, since they didn't buy the NES as soon as it came out (remember, this is the console that ended the video game crash, but it took awhile, people weren't so hocked up on video game steroids at the time), wouldn't remember the black buttons. The information is even hard to find on video game history sites. I just find it rather strange that the gameplay film was shot with a first run unit and the shot at the end was done with a second run unit. That tells me that they had shot the gameplay segment long before the game was actually ready for release in the US.