Plot hole: Towards the end, when Nick is holding Christine hostage in the CRS cafeteria, when the waiter drops the tray and the guards start shooting, Nick & Christine take off and run along the back and out a rear door into the stairwell. He does not look back to the rest of the cafeteria. He runs straight for the door as the guards continue to shoot. Feingold is then shot while standing in line back by the food counter. When Nick is on the roof and Christine is trying to tell him its all fake, he says he saw Feingold get shot. Nick actually never saw this.
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Mistakes
Towards the end, when Nick is holding Christine hostage in the CRS cafeteria, when the waiter drops the tray and the guards start shooting, Nick & Christine take off and run along the back and out a rear door into the stairwell. He does not look back to the rest of the cafeteria. He runs straight for the door as the guards continue to shoot. Feingold is then shot while standing in line back by the food counter. When Nick is on the roof and Christine is trying to tell him its all fake, he says he saw Feingold get shot. Nick actually never saw this. See more...
The Game mistakes
Continuity: When Nicholas pulls Christine out of the elevator he is standing just above it and reaching through the opening. But in the next wide shot from outside the cabin he is pulling her through the door a few meters above the cabin.
Deliberate "mistake": Every time Nicholas enters his gate at home, it it daylight and then when he drives up to the house it is night. Either he has a 300 mile property or there is something else going on. It would appear that it is deliberate as it happens many times in the film. Symbolically, Nick is leaving the world as he appears with wealth and privilege (light) and entering the real van Orton world of solitude and sadness (dark).