10 Movie Secrets That Were Hiding In Plain Sight

2. The Guards Not Giving A Damn - Shutter Island

Shutter Island's final twist reveals that the whole narrative is a form of therapy concocted to snap psychiatric patient Teddy out of delusions he's convinced himself are real, with pretty much everything in the film being constructed purely for him, something which becomes obvious on the second watch.

The most immediately apparent detail that suggests everything is simply an act is the way the employees of the island constantly mess up the "roles" they're given. Teddy's alleged detective partner (actually a doctor on the island) struggles to even get out his badge when he first arrives because it's attached to his gun holster, something which he's not used to wearing.

However, the most obvious indication that the story Teddy has been told isn't true is when he and the guards are searching for a missing patient. Though some are indeed pretending to search for her, a few shots make it clear that some guards are just relaxing. They're surprisingly laid back considering there's a missing person, but that's because they know there really isn't, and have no drive to actually look around the premises.