Objectively, Simons and Chabris (and many others) have a lot of data to support these ideas. Subjectively, I can say that these types of tasks (inattentional blindness, change blindness, etc.) are humbling.
Even having a clue why I'm linking this, I virtually guarantee you won't catch everything.
And even if you do catch everything... the real thing to notice is that you had to look. Your brain does not flag these things naturally. Dreams are notorious for this sort of thing, but even in the waking world your model of the world is much less rich than you think. Magic tricks like to hide in this space, for instance.
We don't memorize things that the environment remembers for us if they aren't relevant for other reasons.
What this demo demonstrates to me is how incredible willing we are to accept what seems familiar to us as accurate.
I bet if you look closely and objectively you will see even more anomalies. But at first watch, I didn’t see most errors because I think accepting something is more efficient for the brain.
