Sometimes, what you see on the screen isn’t a mistake—it’s a subtle detail, foreshadowing the future of the story. A keen eye for details can help a perceptive viewer spot some very unusual filmmaking and scriptwriting decisions. While some might write these off as weird errors or bloopers, others, with a more detective-like inclination, might put the entire plot together and see some major twists coming a mile away.

Finding something to watch on Netflix can take a long time, and you may just end up rewatching something you've already seen. (Hello, eighth viewing of Parks and Rec.) Say you know that you're in the mood for a dark scary movie, however — Netflix…