I was at the library yesterday looking at issues of TV Guide from the 70s, and I noticed some odd things. A few times there are articles that are not listed in the issue's table of contents. And when I looked up one issue on Ebay, some of the issues being sold had an article not present in the issue I'd seen at the library. How often did different editions of TV Guide have different editorial content? And why put articles in one issue and not the other?