Logical Errors In Movies That Should Have Been Obvious To Us
Sometimes it's the little things that make a big difference. After learning about these logical errors, you'll look at the movies differently.

Hangover
In the movie Hangover, the protagonists not only have a massive mental blackout after a night of drinking, but also: their friend Doug is missing. They find him at the end of the movie on the roof of their hotel.
But how come security didn't notice that four of their drunken guests wandered onto the roof and one of them is still up there? Since there is a casino downstairs, we can be sure that every corner of the hotel is equipped with security cameras.