This question has a picture that is "© 2001 - 20th Century Fox - All Rights Reserved" according to IMDB, from where it appears to be sourced. The puzzle has been published on another site, although the puzzle itself doesn't appear to be plagiarism (the user posting this puzzle appears to have created it on both sites) I can't help but think using copyright movie images might be a problem. Can the moderators say what the policy on this sort of thing is?
As far as I can tell, the image augments the description of the puzzle and could easily be removed. That's not to say the image should be removed, but just that the post won't be harmed much if it were. Stack Exchange sites have a clear process for handling copyright violations as explained in point 16 of the Terms of Service. Neither the moderators nor any other user is obligated to enforce copyright law. (Which is good because law is a highly technical field.) We have a "Designated Agent" for just this purpose.
We generally frown on plagiarism, but, as you say, it's hardly a concern if the author submitted to both sites. As a courtesy, adding a link from one version to the other seems in order. (I see that the author has already done that.)