Should we give this one alternate titles for posters and perhaps book covers? Or should those be separate tropes?
I can think of more than a couple movies and books where something that should be a huge twist... is staring at you as soon as you're so much as browsing for it. Plus there's some examples of those already.
Many of the entries on both the trope page and work pages forget that Tropes Are Not Bad and discuss this trope as if it is a detriment. That's going to need quite a bit of clean up, and the explanation should probably be modified to make it clear that being spoiled is not an inherently bad thing.
movies based on real life events should not be included in this trope.
its like feeling spoiled in downfall that hitler dies, or in titanic that the ship sinks.
a movie that is in this trope (the great escape) says the trailer "spoils" that some of the men do escape. WELL, DUH.
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Some historical events fall under You Should Know This Already, like the ones you mention. Others don't. A lot of people might have been vaguely aware that The Great Escape is based on a true story, but not know which characters escape/survive.
If there's a chance a significant percentage of your audience might not already know how the story ends, isn't it best to keep it that way?
[[OhCrap iSanity!]]
If someone had never seen the movie before, would it still be this trope?
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I know it's late for my response, but I think it would qualify more for Late-Arrival Spoiler if the movie is sufficiently old. If it isn't...then I don't know.
Do trailers released after the work's release count forwards the trope? Like it officially reveals something that would only happen later on in the work?
Continue the bloodline, Fujimaru!