Was this a glitch? This movie reminds me of a dream I had years ago and I just saw it for the first time

I have no idea what to think of this but I just saw the movie Shutter Island and it had so many things I've seen in a dream I had a year ago. Anyone ever have this happen to them? Besides the movie, the dream actually happened a year before I even saw the movie. I did watch other movies like that but I can't remember them. But this was actually really creepy. I've had other movies remind me of other dreams I had before but that was about it. I'm just wondering if this would be considered a glitch.