Quote Originally Posted by Lirion View Post
My point is we don't know when they made this trailer, but yes, the newest trailer should look better than the older ones.
People haven't taken into consideration several possible variables. One variable it could have simply been a mistake and another just as possible answer is they wanted to show what the earliest or an earlier build of the game looked like because people are actually curious about those kind of things and in essence they could have been showing their progress.

Without any further verification than what Yoshi-P gave us earlier stating a rudimentary mistake. We have nothing else to go on.