When Inspector RD & his Asst. discuss the habit of a person to borrow the other person's pen to sign the same form, the Marriage Certificate shows "Durban" as the city whereas it should actually have been Cape Town because Ranvir and Sophia allegedly got married in Cape Town.
The goof item below may give away important plot points.
Near the end of the movie, Saif Ali Khan claims that there was no bomb in the car, intending it to seem as if the car blew up due to the fuel tank explosion. However, the car blew up significantly before it hit the fuel tank truck, which would only have been possible if there was an explosive device in the car.