The entire lead cast had to attend vigorous training in order to get into shape for the film. Aishwarya Rai Bachchan had to lose weight, and Hrithik Roshan had to gain it.
In the chase sequence towards the movie's end, while in Brazil, Aryan
and Sunehri are shown driving their bike on the left side of the road along with the other traffic, when vehicles drive on the right side of the road in Brazil. This is because the chase scene was in fact filmed in Durban, South Africa.
After the initial robbery of the Crown in the desert when Mr A is escaping the guards, and is sand-surfing, a separate trail track is clearly visible on the sand. Its obvious that there is a retake and the film-maker did not clean the earlier tracks.
Shonali says that a Mauser 9mm does 3000FPS. In reality no handgun can do that. Only assault rifles like the AK, M16AI can deliver a muzzle velocity of that magnitude. Mauser 9mm can have a muzzle velocity around 2000-2200 FPS.