Character mistake: In the final scene Cobb's children class him "daddy!" but Cobb's son also calls him "Leo!"
Character mistake: On the Shinkansen train, Cobb says, "I'm getting off in Kyoto." Not exactly wrong, but a moment afterwards they are in Tokyo and you see the Tokyo skyline.
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.
jshy7979