I found this listing for an Atari 2600 cart of Halloween which of course is an actual game. However the cover art doesn't match up to the scans on-site and the game studio listed on the art doesn't match up either.
Listing:
http://www.ebay.com/itm/H...0&hash=item35ed6b597dGame:
[img width=500 height=439]http://i.ebayimg.com/00/s/ODQzWDk2MA==/z/h~cAAOSwHnFVnQzU/$_12.JPG[/img]
I'm probably wrong and it wouldn't at all surprise me, but is this just a variation or a re-release/unlicensed or what.