According to this post on Adrants, Chevrolet banned this commercial after it was shot because they were concerned that people might not realize that it was a dream. You can see the spot here. Apparently they were still concerned after they put the language, "This is a dream. Do not drive without a license." on the letterbox frames.
I wonder if Chevrolet is smart (devious?) enough to pull the commercial and then circulate it on the internet in order to get people to opt into watching it rather than interrupting them with a TV spot. The funny thing is, at least for me (and for all of you that clicked through the link), it seems to have worked.