Revealing mistake: When Ariadne is pulling the two huge mirrors close together underneath the bridge with Cobb, watch her when she is closing the second mirror. She steps over something even though there is nothing present for her to step over. There must have been a green screen frame there for her to step over.
Revealing mistake: In the scene and shot where Arthur explains how to create the looping architecture. On the staircase reveal - as the camera comes to a rest at the end of the "crane down" the entire stair case wobbles at the end of the shot.
Revealing mistake: When Arthur is gathering everything together in zero gravity for his improvised kick, there are several times when you can see the actors' harnesses. Most notably in the seat of Arthur's pants when he grabs the first charge and the backpack out of the air.
Revealing mistake: When Arthur is fighting the two projections in the hotel hallway and the hallway tilts, Arthur grabs hold of and hangs on the right wall with the ceiling to his right. The following scene shows him running on the opposite wall with the ceiling to his left.
Revealing mistake: When the track-Humvee gets blown up, there is a full second delay between the explosion and the Humvee getting flipped.
Revealing mistake: When the chase in Mombasa has just begun, the camera is moving in front of Cobb at one point. Notice how the people behind the camera are moving into Cobb's paths, despite the fact that they weren't there a second ago?
Answer: The answer above is solid and I agree, but there's another plausible way of looking at it. It is implied at the end that Cobb could still be dreaming (we never see if the top stops spinning). If that's the case, then he would likely dream his children to be exactly how he remembers them.
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