I think the error may have been on the computer description in the winner's showcase. Basically the botch job we've seen before where the description does not match the computer on the screen. I'm sticking my neck out on this because I happen to be typing on a monitor of same brand and similar model to what is shown on the screen, and the size of the keyboard versus the size of the screen makes me think that they had a 21.5" model on stage instead of a 23" model.
But since the contestant won, and would have won only one showcase regardless, they get to file that under "harmless error".