When the main character was playing Tetris, instead of doing his work, he is interrupted by his moron boss Lumberg. Notice the amount of blocks piled up in the game, it changes from a small amount, to a larger amount, and back to a smaller amount. A small mistake but it's there.
Keep in mind that in Tetris you can't replay a section of the game so every time they had to film that scene again there's no way they could get the same block level.
It's very doubtful that the actor paused the game everytime the director yelled "Cut!". Even if he had, everytime they re-shot the scene again (from a different angle, etc.), the actor would have had to un-pause the game and start playing from where he'd left off, not from where he originally began when the shooting of the scene began. Hence the game screen would appear differently in each shot once they assembled the individual takes together into a whole scene.
Maybe they should have played on his screen, a Tetris game which had been video taped prior to shooting, and then just had the actor pretend as though he was playing the game. That way, after each take, they would just need to reset the video tape back to it's original starting point so that it would look the same each time the scene was shot.
Keep in mind that this game is Tetris. The purpose of the game is to form lines with the different shaped blocks, in which case the number of blocks decreases. So, think about it this way. At the beginning of the scene, perhaps Peter had just started playing the game. The camera changes angles so it is away from the position in which you can see the screen. When it gets back to Peter, more blocks have built up. After changing angles twice again, and the amount of blocks are different, it doesn't mean that it is a slip-up, it could simply mean that Peter has managed to make a few lines with the blocks, in which case there would once again be fewer blocks.
I saw what he is talking about. When it shows Peter from behind playing tetris - the whole time it's obviously one game, but in the middle of that scene it shows a close up of the screen and it's obviously not the same game. The scene shows Peter from behind playing the game and it's 1 game, then it shows him again - same game, then it shows the close up - different game, behind again - same game as before. Dig?
Most of the slip-ups in movies are simply because takes had to be re-shot or changed or cut or whatever. Of course the Tetris game will look different, they probably stopped and re-shot certain parts and kept others because the acting was good. Being specific about what is on the Tetris game would be stupid and time consuming.
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