The Matrix is one of the biggest and most influential films of all time, spawning a massive franchise and giving fuel to conspiracy theories that we all really are just living in an advanced computer situation, which would mean that right now you're inside a computer, reading words off a computer screen. Terrifying, isn't it?
One of the plot devices used in the film is the idea of 'glitches' - little tell-tale errors that give us the clue that not everything we're seeing is real. That doesn't excuse this mistake, though. During an epic fight seen between Neo and Agent Smith, a wall gets punched clean through. Before the punch even lands, we can clearly see that there's a breakaway section of the wall that's all lined up and ready to fall out when someone touches it. That's not a glitch, that's a mistake!