I am the webmaster for many sites, and one in particular is showing errant results in standard Web Search. Search results list movie showtimes for the website in question, which is not a movie theater at all - it is a restaurant/pub. They are fielding dozens of calls per day about movies which don't exist there.
I've followed the "Report a Problem" procedure but that ultimately is for the Maps product. I received an email saying they've addressed the problem, but it still exists.
There is nowhere I can find for me to edit this data as the site owner, and there seems to be no way to contact Google about problems with the Web Search product.