Not sure if its region dependent, but my Netflix shows a warning about product placement at the beginning of the show.

I have to say that it was a bit of an eye-opener- a lot of these ads are not obviously product-placement at all. The one that shocked me the most was an episode of "Friends from College" where the main characters went up the Napa valley for some wine tasting and then stopped into McDonalds on the way back- it was such a sharp, natural and realistic storyline that I would have never assumed that it was product placement. It dealt with "McDonalds-shame" in very sophisticated way that you wouldn't think McDonalds was capable of, and actually made me feel (as somebody who has been wine tasting in Napa and tries to avoid Mickey Ds) that a fast food burger is "allowed".