Revealing mistake: When Bobby's wife is dragged to her knees by the chain, you can make out the shape of her knee pads under her trousers. (00:41:10)
Continuity mistake: After swimming in the pool, Aron, Kristi and Megan pose for a picture. The feathers in both girls' hair are on their right. When Aron presses the shutter on the camera, the feather in Megan's hair has switched to her left.
Continuity mistake: After Teddy takes his dead daughter's shoe off, its position changes between angles.
Continuity mistake: The last two pictures on the left on the wall going up the stairs change continually throughout the movie, at least 10 times. (00:24:35 - 00:26:35)
Continuity mistake: In the scene where Benicio Del Toro is in the tavern listening to the townsfolk discuss his brother's death, you see him finish his alcoholic beverage, however, in the next shot his glass jumps to being half full.
Continuity mistake: The blue van comes to the station and parks after the lights come back on in the diner. When the driver gets out of the van, the car has moved backwards a couple of meters. (01:06:55)
Continuity mistake: Quorra's suit has a light stripe running down its right leg. When she's captured by Tron, the light stripe is now on the left leg. This is most likely a flipped shot as her fringe/bangs are also slanting the wrong way. (01:33:50)
Continuity mistake: When Dewey and Gilleece are in the rail roller truck, the tailgate of the truck is clean with nothing on it. After the attempt to climb on 777 fails and the door gets smashed off, the tailgate suddenly has some kind of equipment either attached to or exposed off the tailgate in the middle.
Continuity mistake: In the scene where Renai is listening to the baby monitor, she drops it when the voice screams, "NOW!" On the floor, the speaker is facing down, but in the next shot, it is facing up. (00:22:35)