Does iTunes check in any way to be sure a download is clean?

I've purchased a few TV shows with 'glitches' (random static or pixelizations), though none of them have lasted more than a second or two.
I know that iTunes allows only one download of each purchase. Given that, I would have thought that it would do some sort of hash count check or some sort of verification that the download is clean. Is this a bad assumption?
So what happens if you buy a song or video and it turns out to be unplayable because of download problems?

Hi, Mary Jo,
Hash counts and such just help confirm that a file has downloaded completely and hasn't been corrupted in download. It doesn't help with video encoding errors, which are what most such pixelization and static glitches are (for instance, using too high a compression rate for the action on the screen). The only fix for such problems is for the content owner to re-encode the video, so as Chris suggested you need to let the iTunes Store know about the problem so they can go to the owner and request a new copy.
The "Report a problem" link in your Purchase History that Chris suggested hasn't proven to be very reliable. You might instead contact the iTunes Store customer support department through the form at the bottom of their web page and explain the problem to them that way.
Regards.

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