F. Lee Bailey was famously on the Johnny Carson show to prove how badly our eyes lie to us. He hired an actor to randomly run on stage and pretend to shoot Carson and run away. After the incident, he asked witnesses to describe what happened, and then they played back the video. It was absurd how much of their testimony was wrong, and how much they entirely missed. Like the assailant was only wearing one shoe and it was a high heel, and IIRC, not one of the witnesses mentioned that.
You may think you see everything and remember everything (seems absurd) and you are probably better at it than most people...but even if you are, you still miss a lot. It's just science.