Back in the days when I saw every movie our local theater showed (two a week), I didn't bother studying movie posters or bothering to watch trailers (that was social time), so I was properly shocked at the twists in the movies Soylent Green and Planet of the Apes. But that was 50 years ago. It happens more and more often these days that a film studio -or rather, the marketing team- will go ahead and share way too many details that the filmmakers would rather reveal in the movie itself. Merchandise, released before opening day to capitalize on the hype, often adds to the spoilers.
Cracked has 15 examples of movie marketing spilling secrets within the movie plot. If you're lucky, you didn't know enough about the movie going in to put two and two together before you watched it. Still, the Planet of the Apes poster didn't look like it was from 1968. These do, and they have no spoilers. The more modern-looking poster was produced after the secret was out, which was just bad luck for subsequent generations who could have used a good twist.
